1. An information processing system comprising: a sensor for measuring a human acceleration produced by human movement for a predetermined time period; a processing part for obtaining feature data related to a speed of human movement based on the measured acceleration data; and a storage part for storing the obtained feature data, wherein the processing part is configured to: obtain the speed of movement per predetermined unit time from the acceleration data measured by the sensor; count the speed of movement above a reference value, from the obtained speed of movement per unit time, with respect to each of a plurality of reference values of the speed of movement, as a cumulative frequency for the reference value of the speed of movement; and obtain statistical data based on the distribution between the reference values of the speed of movement, and the log of the cumulative frequency for the reference values, as the feature data of human movement, and storing the feature data in the storage part, wherein the speed of movement is a zero crossing number indicating the number of times the acceleration data is zero or crosses zero, wherein the processing part is configured to: obtain the number of zero crossings per predetermined unit time, as the speed of movement, from the acceleration data measured by the sensor; count the number of zero crossings above a reference value, from the number of zero crossings obtained per unit time, with respect to each of a plurality of reference values of the zero crossing number, as a cumulative frequency for the reference value of the zero crossing number; obtain statistical data based on the reference value of the zero crossing number and on the log of the cumulative frequency for the reference value, as feature data of human behavior; and store the obtained feature data in the storage part.