hereinafter , a first embodiment of the present invention will be described with reference to the drawings . in the embodiment , an example of a wristwatch will be described as an example of an electronic apparatus . fig1 is a block diagram illustrating a configuration of a wristwatch 100 according to the embodiment . the wristwatch 100 is an electronic watch that calculates and displays the cushioning properties of shoes ( in particular , running shoes ) of a user to calculate the wear degree of the shoes . the cushioning properties of the shoes refer to performance of absorbing shock to the shoes ( shock - absorbing properties ) and , particularly , refer to buffer power of a midsole . in the example illustrated in the drawing , the wristwatch 100 includes a cpu 101 ( wear degree calculating unit , cumulative value calculating unit , cushioning property calculating unit , display control unit ), a vibrating unit 102 , an alarm unit 103 , an illumination unit 104 , a body movement detecting unit ( measuring unit ) 105 , an input unit 106 , a display unit 107 , a memory unit ( storing unit ) 108 , a power supply unit 109 , and a communication unit 110 . the body movement detecting unit 105 includes an acceleration sensor that detects an acceleration , and measures the number of steps of a user during traveling . specifically , the body movement detecting unit 105 measures the number of steps of a user during traveling using ( method 1 ) or ( method 2 ). ( method 1 ) the body movement detecting unit 105 detects a vertical body vibration during traveling with an acceleration sensor and measures the number of steps of the user during traveling . according to ( method 1 ), the number of steps can be measured with higher accuracy as compared to ( method 2 ). ( method 2 ) the body movement detecting unit 105 detects a vertical body vibration during traveling with an acceleration sensor , measures the number of steps of the user within a predetermined amount of time ( for example , one minute ), and measures a traveling pitch ( number of steps / min ) of the user . the traveling pitch refers to the number of steps per minute . the body movement detecting unit 105 multiplies the measured traveling pitch by a traveling time ( unit : min ) during which the user travels so as to measure the number of steps of the user during traveling . in this ( method 2 ), the number of steps is measured by the acceleration sensor only within a predetermined amount of time ( for example , one minute ), and thus the number of steps during the entire period of the traveling time is measured after completion of the traveling of the user . therefore , in ( method 1 ), it is necessary that the number of steps must be measured by the acceleration sensor while the user travels . however , according to ( method 2 ), it is sufficient that the number of steps is measured by the acceleration sensor only within a predetermined amount of time , and thus a processing load on the wristwatch 100 can be reduced . the cpu 101 controls each unit included in the wristwatch 100 . for example , using a coefficient in consideration of information relating to the user , the cpu 101 converts the number of steps measured by the body movement detecting unit 105 into a wear degree indicating a degree to which shoes of the user are worn out . examples of the information relating to the user include a body weight of the user , a traveling speed of the user , a running level of the user , and a gender of the user . the traveling speed refers to the running quickness . the running level refers to , for example , an index indicating the time or the running ability of the user when running a predetermined distance . in addition , the cpu 101 reads the cumulative value of the wear degree from the memory unit 108 , and adds the calculated wear degree to the read cumulative value to calculate a new cumulative value of the wear degree . the cpu 101 overwrites the memory unit 108 with the calculated cumulative value of the wear degree as a cumulative value of the wear degree of the shoes . in addition , the cpu 101 calculates cushioning properties of the shoes based on the calculated cumulative value of the wear degree . the cpu 101 displays the calculated cushioning properties of the shoes on the display unit 107 . the vibrating unit 102 generates a reference clock signal for the operation of the cpu 101 or a clock signal for timekeeping . the cpu 101 and the vibrating unit 102 are the timekeeping units for keeping the time . the timekeeping unit realizes a stopwatch function for keeping the traveling time of the user or a clock function for displaying the present clock time . the alarm unit 103 is a sound generating device that generates a check sound or a warning sound . the illumination unit 104 is a backlight that illuminates the display unit 107 . the input unit 106 is configured of a switch capable of being manipulated from the outside and receives an input . for example , the input unit 106 receives an input of the information relating to the user such as the body weight or running level of the user . in addition , the input unit 106 receives an input of an instruction to start the measurement of the number of steps or an input of an instruction to end the measurement of the number of steps . the display unit 107 is , for example , a liquid crystal display and displays the clock time , information relating to the cushioning properties of the shoes of the user , and the like . the memory unit 108 is configured of a rom ( read only memory ) or a ram ( random access memory ) and stores the cumulative value of the number of steps of the user during traveling or the cumulative value of the wear degree of the shoes of the user . the initial values of the cumulative value of the number of steps and the cumulative value of the wear degree of the shoes are “ 0 ”. in addition , the memory unit 108 stores a program which is executed by the cpu 101 in advance . the power supply unit 109 supplies electrical power to each unit included in the wristwatch 100 . the communication unit 110 communicates with other apparatuses . next , a relationship between the cushioning properties of the shoes and the wear degree thereof will be described . the lower the wear degree of the shoes , the higher the cushioning properties of the shoes , and the higher the wear degree of the shoes , the lower the cushioning properties of the shoes . the lower the amount of usage of the shoes , the lower the wear degree of the shoes , and the higher the amount of usage of the shoes , the higher the wear degree of the shoes . therefore , the wristwatch 100 according to the embodiment measures the number of steps of the user during traveling as the amount of usage of the shoes and converts the measured number of steps into the wear degree of the shoes . the wristwatch 100 calculates and displays cushioning properties of the shoes based on the converted wear degree . hereinafter , a method of calculating the wear degree of the shoes will be described . w refers to the cumulative value of the wear degree of the shoes . the wear degree w of the shoes is calculated from the following equation ( 1 ). however , a , b , and c refer to coefficients in consideration of the information relating to the user . a refers to the coefficient in consideration of the body weight of the user , b refers to the coefficient in consideration of the traveling speed of the user , and c refers to the coefficient in consideration of the running level of the user . fig2 is a graph illustrating a relationship between a load applied to shoes , and the body weight and the traveling speed in the embodiment . in the graph shown in this drawing , the vertical axis represents the load g applied to the shoes , and the horizontal axis represents the traveling speed speed . a curve 301 indicates a relationship between a load applied to shoes , and the body weight and the traveling speed of a heavy - weight user . in addition , a curve 302 indicates a relationship between a load applied to shoes , and the body weight and the traveling speed of a light - weight user . as shown in the drawing , the faster the traveling speed , the higher the load applied to the shoes , and the slower the traveling speed , the lower the load applied to the shoes . therefore , the faster the traveling speed of the user , the higher the coefficient b in consideration of the traveling speed of the user , and the slower the traveling speed of the user , the lower the coefficient b in consideration of the traveling speed of the user . in addition , as compared to the heavy - weight user ( curve 301 ), even at the same traveling speed , the light - weight user ( curve 302 ) applies a lower load to the shoes . therefore , the heavier the body weight of the user , the higher the coefficient a in consideration of the body weight of the user , and the lighter the body weight of the user , the lower the coefficient a in consideration of the body weight of the user . fig3 is a graph illustrating a relationship between the traveling speed and the running level in the embodiment . in the graph shown in this drawing , the vertical axis represents the traveling speed speed , and the horizontal axis represents the running level runlv . as shown in the drawing , the higher the running level , the faster the traveling speed , and the lower the running level , the slower the traveling speed . therefore , the higher the running level of the user , the higher the coefficient c in consideration of the running level of the user , and the lower the running level of the user , the lower the coefficient c in consideration of the running level of the user next , the display content indicating the cushioning properties of the shoes which is displayed on the display unit 107 will be described . fig4 a , 4b , and 4c are schematic diagrams illustrating the display content indicating the cushioning properties of the shoes which is displayed on the display unit 107 in the embodiment of the present invention . as shown in fig4 a , the display unit 107 displays a bar l indicating the cushioning properties of the shoes along with the present clock time and the battery capacity . in the bar l indicating the cushioning properties of the shoes , a black portion indicates the cushioning properties , and a white portion indicates the wear degree . as shown in fig4 , in the bar l indicating the cushioning properties of the shoes , in an initial status l 1 , the area of the cushioning properties ( black portion ) is large , and the area of the wear degree ( white portion ) is small . moreover , as the lifetime of the shoes is gradually shortened , the area of the cushioning degree ( black portion ) is decreased ( the area of the wear degree ( white portion ) is increased ). that is , when the black portion of the bar l indicating the cushioning properties of the shoes is decreased ( when the white portion is increased ) as in a status l 3 where the end of the lifetime is approximately reached after an intelmediate status l 2 , the bar l indicates the state where the end of the lifetime of the shoes is approximately reached . as shown in fig4 c , the bar l may indicate the wear degree of the shoes . specifically , when the black portion in the bar l indicates the wear degree of the shoes , the wear degree is low in an initial status l 4 . moreover , as the lifetime of the shoes is gradually shortened , the area of the wear degree is increased . when the black portion indicating the wear degree of the shoes is increased as in a status l 6 end of the lifetime is approximately reached after an intermediate status l 5 , the bar l may indicate the state where the end of the lifetime of the shoes is approximately reached . next , a cushioning property display process where the wristwatch 100 according to the embodiment displays the cushioning properties of the shoes on the display unit 107 will be described . fig5 is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch 100 according to the embodiment . ( step s 101 ) the cpu 101 receives an input of personal information , which is the information relating to the user , from the input unit 106 . the user inputs the personal information by manipulating the input unit 106 . the input personal information described herein is the body weight of the user and the running level or gender of the user . next , the process proceeds to step s 102 . ( step s 102 ) the cpu 101 determines whether or not an instruction to start the measurement of the number of steps is input from the input unit 106 . when the instruction to start the measurement is input , the process proceeds to step s 103 . when the instruction to start the measurement is not input , the process returns to step s 102 . ( step s 103 ) the cpu 101 starts to keep the time using the stopwatch function . next , the process proceeds to step s 104 . ( step s 104 ) the cpu 101 starts to measure the number of steps using the body movement detecting unit 105 . next , the process proceeds to step s 105 . ( step s 105 ) the cpu 101 accumulates the number of steps after the start of the measurement . in addition , the cpu 101 calculates the traveling speed by integrating the acceleration detected by the acceleration sensor included in the body movement detecting unit 105 . next , the process proceeds to step s 106 . ( step s 106 ) the cpu 101 determines whether or not an instruction to end the measurement of the number of steps is input from the input unit 106 . when the instruction to end the measurement is input , the cpu 101 ends the timekeeping of the stopwatch and the measurement of the number of steps . the process proceeds to step s 107 . on the other hand , when the instruction to end the measurement is not input , the process returns to step s 105 . ( step s 107 ) the cpu 101 converts the measured number of steps into the wear degree . specifically , the cpu 101 determines the coefficient a in consideration of the body weight input in step s 101 , the coefficient b in consideration of the running level input in step s 101 , and the coefficient c in consideration of the calculated traveling speed to calculate the wear degree from the above - described equation ( 1 ). next , the process proceeds to step s 108 . ( step s 108 ) the cpu 101 reads the cumulative value of the wear degree from the memory unit 108 , and adds the calculated wear degree to the read cumulative value to accumulate the wear degree . the cpu 101 writes the memory unit 108 with the accumulated wear degree as a cumulative value of the wear degree . in addition , the cpu 101 adds the calculated number of steps to the cumulative value of the number of steps stored in the memory unit 108 , and the memory unit 108 is overwritten with the obtained value . next , the process proceeds to step s 109 . ( step s 109 ) the cpu 101 calculates cushioning properties based on the accumulated wear degree . next , the process proceeds to step s 110 . ( step s 110 ) the cpu 101 displays the display content indicating the calculated cushioning properties on the display unit 107 . specifically , the cpu 101 displays the bar l corresponding to the calculated cushioning properties on the display unit 107 . next , the cushioning property display process ends . as described above , the wristwatch 100 according to the embodiment converts the number of steps during traveling into the wear degree to obtain a degree to which the shoes are used up , and calculates and displays the cushioning properties , which refer to the function of absorbing shock , based on the accumulated wear degree . as a result , the decrease degree of the cushioning properties of the shoes can be recognized . in addition , in the wristwatch 100 according to the embodiment , not only the number of steps during traveling but also the coefficients in consideration of the information relating to the user such as the body weight , the traveling speed , the running level , and the gender are obtained . therefore , the decrease degree of the cushioning properties of the shoes corresponding to the characteristics of the user can be recognized with higher accuracy . hereinafter , a second embodiment of the present invention will be described with reference to the drawings . a wristwatch 100 according to this embodiment has the same configuration as that of the wristwatch 100 according to the first embodiment . this embodiment has a difference from the first embodiment , in that the memory unit 108 includes a nonvolatile memory ; and the nonvolatile memory stores the cumulative value of the number of steps and the cumulative value of the wear degree . in addition , the cpu 101 transmits the cumulative value of the number of steps and the cumulative value of the wear degree , which are written on the nonvolatile memory , to an external apparatus such as a computer through the communication unit 110 . as a result , the cumulative value of the number of steps and the cumulative value of the wear degree can be backed up onto the external apparatus . hereinafter , a cushioning property display process where the wristwatch 100 according to the embodiment displays the cushioning properties of the shoes on the display unit 107 will be described . fig6 is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch 100 according to the embodiment . since the processes of step s 201 to step s 208 are the same as the above - described processes of step s 101 to step s 108 , the description thereof will be omitted . ( step s 209 ) after step s 208 , the cpu 101 writes the nonvolatile memory of the memory unit 108 with the cumulative value of the wear degree and the cumulative value of the number of steps . next , the process proceeds to step s 210 . ( step s 210 ) the cpu 101 transmits the cumulative value of the wear degree and the cumulative value of the number of steps to the external apparatus through the communication unit 110 . next , the process proceeds to step s 211 . since the processes of step s 211 to step s 212 are the same as the above - described processes of step s 109 to step s 110 , the description thereof will be omitted . as described above , in the embodiment , the cpu 101 writes the nonvolatile memory of the memory unit 108 with the cumulative value of the wear degree calculated and the cumulative value of the number of steps . as a result , when a battery of the wristwatch 100 is exchanged , data relating to the cumulative value of the wear degree and the cumulative value of the number of steps can be prevented from being erased . in addition , in the embodiment , the cpu 101 transmits the cumulative value of the wear degree and the cumulative value of the number of steps to the external apparatus through the communication unit 110 . as a result , the cumulative value of the wear degree and the cumulative value of the number of steps can be backed up to the external apparatus . in addition , in the external apparatus , the cushioning properties can be calculated from the cumulative value of the wear degree and displayed . hereinafter , a third embodiment of the present invention will be described with reference to the drawings . a wristwatch 100 according to this embodiment has the same configuration as that of the wristwatch 100 according to the first embodiment . this embodiment has a difference from the first embodiment , in that the cumulative value of the number of steps and the cumulative value of the wear degree can be initialized . the input unit 106 receives an input of an instruction to initialize data relating to the wear degree . when an instruction to initialize the data relating to the wear degree is input from the input unit 106 , the cpu 101 ( initializing unit ) deletes and initializes the cumulative value of the number of steps and the cumulative value of the wear degree stored in the memory unit 108 . that is , when the instruction to initialize the data relating to the wear degree is input , the cpu 101 sets the cumulative value of the number of steps and the cumulative value of the wear degree , stored in the memory unit 108 , as 0 . hereinafter , an initialization process where the wristwatch 100 according to the embodiment initializes the data relating to the wear degree of the shoes will be described . fig7 is a flowchart illustrating the procedure of the initialization process which is executed by the wristwatch 100 according to the embodiment . ( step s 301 ) the cpu 101 receives an input of an instruction to initialize the data relating to the wear degree of the shoes from the input unit 106 . the user inputs the instruction to initialize the data relating to the wear degree by manipulating the input unit 106 . next , the process proceeds to step s 302 . ( step s 302 ) the cpu 101 deletes the cumulative value of the number of steps and the cumulative value of the wear degree , which are stored in the memory unit 108 , to initialize the cumulative value of the number of steps and the cumulative value of the wear degree . next , the initialization process ends . as described above , in the embodiment , when the instruction to initialize the data relating to the wear degree of the shoes is input from the input unit 106 , the cpu 101 initializes the cumulative value of the number of steps and the cumulative value of the wear degree . as a result , for example , when the user changes the shoes , data can be initialized . hereinafter , a fourth embodiment of the present invention will be described with reference to the drawings . a wristwatch 100 according to this embodiment has the same configuration as that of the wristwatch 100 according to the first embodiment . this embodiment has a difference from the first embodiment , in that the cushioning properties are calculated and displayed for each pair of shoes of the user . the input unit 106 ( select unit ) receives an input of the selection of shoes . for example , the user selects a pair of shoes from among plural pairs of shoes displayed on the display unit 107 . the memory unit 108 stores the cumulative value of the number of steps and the cumulative value of the wear degree for each pair of shoes of the user . specifically , the memory unit 108 includes plural memories , and each memory stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes . that is , the memory unit 108 includes the memories corresponding to the plural pair of shoes , respectively . for example , in the memory unit 108 , a memory a stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes a , and a memory b stores of the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes b . the cpu 101 calculates the cushioning properties of the shoes selected by the input unit 106 and displays the calculated cushioning properties of the shoes on the display unit 107 . hereinafter , a cushioning property display process where the wristwatch 100 according to the embodiment displays the cushioning properties of the shoes on the display unit 107 will be described . fig8 is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch 100 according to the embodiment . ( step s 401 ) the cpu 101 receives an input of personal information , which is the information relating to the user , from the input unit 106 . the user inputs the personal information by manipulating the input unit 106 . the input personal information described herein is the body weight of the user and the running level or gender of the user . next , the process proceeds to step s 402 . ( step s 402 ) the cpu 101 receives an input of the selection of shoes from the input unit 106 . next , the process proceeds to step s 403 . since the processes of step s 403 to step s 408 are the same as the above - described processes of step s 102 to step s 107 , the description thereof will be omitted . ( step s 409 ) after step s 408 , the cpu 101 reads the cumulative value of the wear degree , which corresponds to the shoes selected in step s 402 , from the memory unit 108 , and adds the calculated wear degree to the read cumulative value to accumulate the wear degree . the cpu 101 writes the memory unit 108 with the accumulated wear degree as a cumulative value of the wear degree of the shoes selected in step s 402 . in addition , the cpu 101 reads the cumulative value of the number of steps , which corresponds to the shoes selected in step s 402 , from the memory unit 108 , and adds the measured number of steps to the read cumulative value to overwrite the memory unit 108 . next , the process proceeds to step s 410 . ( step s 410 ) the cpu 101 calculates the cushioning properties of the shoes selected in step s 402 based on the accumulated wear degree . next , the process proceeds to step s 411 . ( step s 411 ) the cpu 101 displays the display content indicating the calculated cushioning properties on the display unit 107 . next , the cushioning property display process ends . as described above , in the embodiment , the input unit 106 receives an input of the selection of shoes . in addition , the cpu 101 calculates and displays the cushioning properties of the selected shoes . as a result , when the user uses plural pairs of shoes , the cushioning properties can be calculated and displayed for each pair of shoes of the user . hereinafter , a fifth embodiment of the present invention will be described with reference to the drawings . a wristwatch 100 according to this embodiment has the same configuration as that of the wristwatch 100 according to the first embodiment . this embodiment has a difference from the first embodiment , in that the cushioning properties are calculated and displayed for each pair of shoes of the user . in the fourth embodiment , the user inputs shoes to be used . however , in this embodiment , the wristwatch 100 automatically determines the currently - used shoes of the user based on the traveling speed of the user . the memory unit 108 stores the cumulative value of the wear degree for each pair of shoes of the user . specifically , the memory unit 108 includes plural memories , and each memory stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes . that is , the memory unit 108 includes the memories corresponding to the plural pair of shoes , respectively . for example , in the memory unit 108 , a memory a stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes a , and a memory b stores of the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes the memory unit 108 stores the range of the traveling speed for each pair of shoes of the user . for example , the memory unit 108 stores “ speed × per hour or slower ” as the range of the traveling speed corresponding to shoes for a practice , and stores “ speed × per hour or faster ” as the range of the traveling speed corresponding to shoes for a race . the cpu 101 calculates the traveling speed of the user by integrating the acceleration detected by the acceleration sensor included in the body movement detecting unit 105 . the cpu 101 ( select unit ) reads shoes , which correspond to the calculated traveling speed , from the memory unit 108 and selects the read shoes as the currently - used shoes of the user . hereinafter , a cushioning property display process where the wristwatch 100 according to the embodiment displays the cushioning properties of the shoes on the display unit 107 will be described . fig9 is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch 100 according to the embodiment . since the processes of step s 501 to step s 505 are the same as the above - described processes of step s 101 to step s 105 , the description thereof will be omitted . ( step s 506 ) after step s 505 , the cpu 101 calculates the traveling speed of the user by integrating the acceleration detected by the acceleration sensor included in the body movement detecting unit 105 . next , the process proceeds to step s 507 . ( step s 507 ) the cpu 101 determines whether or not an instruction to end the measurement of the number of steps is input from the input unit 106 . when the instruction to end the measurement is input , the cpu 101 ends the timekeeping of the stopwatch and the measurement of the number of steps . the process proceeds to step s 508 . on the other hand , when the instruction to end the measurement is not input , the process returns to step s 505 . ( step s 508 ) the cpu 101 converts the measured number of steps into the wear degree . a method of converting the number of steps into the wear degree is the same as in the first embodiment . next , the process proceeds to step s 509 . ( step s 509 ) the cpu 101 . calculates an average value of the traveling speed calculated in step s 506 . next , the process proceeds to step s 510 . ( step s 510 ) the cpu 101 reads shoes , which correspond to the average value of the traveling speed , from the memory unit 108 and selects the read shoes as the currently - used shoes of the user . next , the process proceeds to step s 511 . ( step s 511 ) the cpu 101 reads the cumulative value of the wear degree , which corresponds to the shoes selected in step s 510 , from the memory unit 108 , and adds the calculated wear degree to the read cumulative value to accumulate the wear degree . the cpu 101 writes the memory unit 108 with the accumulated wear degree as a cumulative value of the wear degree of the shoes selected in step s 510 . in addition , the cpu 101 reads the cumulative value of the number of steps , which corresponds to the shoes selected in step s 510 , from the memory unit 108 , and adds the measured number of steps to the read cumulative value to overwrite the memory unit 108 . next , the process proceeds to step s 512 . ( step s 512 ) the cpu 101 calculates the cushioning properties of the shoes selected in step s 510 based on the accumulated wear degree . next , the process proceeds to step s 513 . ( step s 513 ) the cpu 101 displays the display content indicating the calculated cushioning properties on the display unit 107 . next , the cushioning property display process ends . as described above , in the embodiment , the cpu 101 automatically determines the currently - used shoes of the user based on the traveling speed of the user , and calculates and displays the determined cushioning properties of the shoes . as a result , when the user uses plural pairs of shoes , the cushioning properties can be calculated and displayed for each pair of shoes of the user . in addition , since the currently - used shoes of the user are automatically determined , it is not necessary that the user directly input the selection of shoes . hereinafter , a sixth embodiment of the present invention will be described with reference to the drawings . a wristwatch 100 according to this embodiment has the same configuration as that of the wristwatch 100 according to the first embodiment . this embodiment has a difference from the first embodiment , in that , when a replacement period of the shoes is reached ( that is , when the cushioning properties of the shoes approximately reach the limit ), the cpu 101 causes a warning to be lighted on the display unit 107 . specifically , when the cumulative value of the wear degree is a predetermined threshold value α or higher , the cpu 101 determines that the replacement period of the shoes is reached and causes a warning to be lighted on the display unit 107 . hereinafter , a cushioning property display process where the wristwatch 100 according to the embodiment displays the cushioning properties of the shoes on the display unit 107 will be described . fig1 is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch 100 according to the embodiment . since the processes of step s 601 to step s 608 are the same as the above - described processes of step s 101 to step s 108 , the description thereof will be omitted . ( step s 609 ) after step s 608 , the cpu 101 compares the cumulative value of the wear degree to the predetermined threshold value α . when the cumulative value of the wear degree is the threshold value α or higher , the process proceeds to step s 610 . when the cumulative value of the wear degree is lower than the threshold value α , the process proceeds to step s 611 . ( step s 610 ) the cpu 101 causes a warning mark to be lighted on the display unit 107 , in which the warning mark indicates that the cushioning properties of the currently - used shoes of the user reach the limit and indicates the replacement period of the shoes . next , the process proceeds to step s 611 . since the processes of step 611 to step s 612 are the same as the above - described processes of step s 109 to step s 110 , the description thereof will be omitted . in the embodiment , the cpu 101 causes the warning to be lighted on the display unit 107 . however , the present invention is not limited to this configuration as long as the user can be notified that the cushioning properties of the shoes reach the limit . for example , the message “ please buy and replace new shoes ” may be displayed on the display unit 107 , or a warning sound may be output from the alarm unit 103 . as described above , in the embodiment , when the replacement period of the shoes is reached , the cpu 101 displays the warning on the display unit 107 . as a result , the user recognizes that the cushioning properties of the shoes reach the limit and recognizes that the shoes should be bought and replaced . a part or all of the functions of the respective units included in the wristwatches 100 according to the first embodiment to the sixth embodiment described above may be realized by recording a program for realizing these functions on a computer - readable recording medium and causing a computer system to read and execute this program recorded on the recording medium . the “ computer system ” described herein includes os and hardware such as peripheral devices . in addition , the “ computer - readable recording medium ” includes portable mediums such as a flexible disc , a magneto - optic disc , a rom , and a cd - rom ; and storages such as a hard disc built into a computer system . further , the “ computer - readable recording medium ” may include the following mediums : mediums on which a program is dynamically stored for a short period of time , for example , a network such as the internet or a communication line such as a telephone line through which a program is transmitted ; and mediums on which a program is stored for a predetermined amount of time , for example , a volatile memory which is built into a computer system functioning as a server or a client . in addition , the program may realize a part of the above - described functions or may realize the above - described functions in combination with a program stored in a computer system in advance . hereinabove , the embodiments of the present invention have been described . however , the present invention is not limited to the above - described embodiments , and various modifications can be added within a range not departing from the scope of the present invention . for example , in the above - described embodiments , the cpu 101 causes the cushioning properties of the shoes to be displayed by graphics . however , the present invention is not limited to this configuration as long as the content which allows the user to check the cushioning properties of the shoes is displayed . for example , the cpu 101 may cause the cushioning properties of the shoes to be displayed on the display unit 107 in percentage . alternatively , the cpu 101 may cause the cushioning properties of the shoes to be displayed on the display unit 107 by target display ( comfortable / limit ). in this case , in the cpu 101 , a case where the cushioning properties of the shoes are a predetermined threshold value β or higher is evaluated as “ comfortable ”, and a case where the cushioning properties of the shoes are lower than the predetermined threshold value β is evaluated as “ limit ”. alternatively , the cpu 101 may cause the cushioning properties of the shoes to be displayed on the display unit 107 by an animation or a graph . in addition , in the above - described embodiments , the cpu 101 converts the number of steps into the wear degree using the coefficient a in consideration of the body weight of the user , the coefficient b in consideration of the traveling speed of the user , and the coefficient c in consideration of the running level of the user . however , the present invention is not limited to this configuration , but the cpu 101 may convert the number of steps into the wear degree using one or two or more of the above - described coefficients a and b . alternatively , the cpu 101 may convert the number of steps into the wear degree without using the coefficients in consideration of the information relating to the user . in addition , in the above - described embodiments , the information relating to the user has been described using the body weight , the traveling speed , and the running level as an example , but the present invention is not limited thereto . for example , the cpu 101 may convert the number of steps into the wear degree using coefficients in consideration of information relating to other users such as gender , characteristics of shoes , or a traveling pitch . in addition , in the above - described embodiments , the wristwatch 100 has been described as an example of the electronic apparatus , but the present invention is not limited thereto . for example , the electronic apparatus may be any of a mobile phone , a smartphone , a pedometer , and the like as long as it can be carried by the user during traveling . in addition , in the above - described embodiments , the acceleration sensor for measuring the number of steps of the user is built into the wristwatch 100 , but the present invention is not limited thereto . the acceleration sensor may be mounted at a position at which the number of steps of the user can be measured . fig1 a , 11b , and 11c are diagrams illustrating examples of mounting positions of the acceleration sensor c for measuring the number of steps of the user . in the example shown in fig1 a , the acceleration sensor c for measuring the number of steps of the user is built into the wristwatch 100 . as a result , the wear degree of the shoes can be calculated without contact between the acceleration sensor c and the shoes of the user . in addition , when the user replaces the shoes , it is not necessary that the acceleration sensor c be mounted on another mounting position . in addition , when the acceleration sensor c is built into a midsole of the shoes , the cushioning properties of the midsole may deteriorate . however , deterioration in the cushioning properties of the midsole can be prevented by mounting the acceleration sensor c on the wristwatch 100 . in addition , in the above - described embodiments , the acceleration sensor detects the vertical body vibration of the user to measure the number of steps , but the present invention is not limited thereto . for example , the acceleration sensor may detect a vibration of arm swinging of the user to measure the number of steps . the vibration of the arm swinging of the user refers to the vibration generated when the arms of the user move back and forth , in addition , in the above - described embodiments , the cumulative value of the number of steps and the cumulative value of the wear degree can be initialized . however , the cumulative value of the number of steps and the cumulative value of the wear degree may be changed to arbitrary values instead of being initialized . for example , an instruction to change the cumulative values to arbitrary values may be received through a manipulation from the input unit 106 . as a result , when initially using the electronic apparatus according to the embodiment , the user can set the cumulative values so as to match the wear state of the shoes used . in an example shown in fig1 b , the acceleration sensor c for measuring the number of steps of the user is built into a peripheral apparatus which is mountable on the outside of the shoes ( for example , a shoelace ) this peripheral apparatus can wirelessly communicate with the wristwatch 100 and transmits the acceleration detected by the acceleration sensor c to the wristwatch 100 . by mounting the acceleration sensor c on the peripheral apparatus , the acceleration sensor c can be easily mounted on another mounting position when the user replaces the shoes . in the example shown in fig1 c , the acceleration sensor c for measuring the number of steps of a user is built into the shoes of the user . the mounting position of the acceleration sensor c is a midsole of the shoes . the communication unit is built into the midsole so as to wirelessly transmit the acceleration detected by the acceleration sensor c to the wristwatch 100 . by mounting the acceleration sensor c on the shoes , the accuracy of the pedometer can be improved . in addition , it is not necessary to install the acceleration sensor c . instead of the acceleration sensor c , a piezoelectric element for measuring the number of steps of the user may be built into the midsole of the shoes . fig1 is a diagram illustrating an example of a method of measuring the number of steps using the acceleration sensor . as shown in this drawing , examples of the method of measuring the number of steps using the acceleration sensor include a method of detecting a vertical direction 1301 of the user ; and a method of detecting a vibration 1302 of arm swinging of the user . in the method of detecting the vertical body vibration 1301 of the user , when detecting the vertical body vibration 1301 of the user once , the body movement detecting unit 105 increases the number of steps by one . that is , in the method of detecting the vertical body vibration 1301 of the user , the cycle of the vibration and the number of steps are synchronized with each other . on the other hand , in the method of detecting the vibration 1302 of arm swinging of the user , when detecting the vibration 1302 of arm swinging of the user once , the body movement detecting unit 105 increases the number of steps by two . that is , in the method of detecting the vibration 1302 of arm swinging of the user , the cycle of the vibration is ½ of the number of steps . for example , when the acceleration sensor is built into the wristwatch 100 , the number of steps of the user can be detected using any of the method of detecting the vertical body vibration 1301 of the user ; and the method of detecting the vibration 1302 of arm swinging of the user . on the other hand , when the acceleration sensor is mounted on the peripheral apparatus or the shoes , the method of detecting the vertical vibration 1301 of the user is preferably used .