1. A display device, comprising: an operation portion for inputting and editing at least one character; a display portion that is capable of displaying, in a form of a dot pattern, the at least one character that has been at least one of input and edited from the operation portion, the at least one character being disposed in at least one display line, each of the at least one display line being configured as one of a vertical line and a horizontal line; a character designating portion for designating, as a designated character, one of the at least one character displayed on the display portion; and a display control portion that displays the at least one character on the display portion using a dot pattern with a display size, the display size being determined in advance in accordance with a number of the at least one display line, displays, in a case where the at least one character displayed on the display portion includes a predetermined special character and the number of the at least one display lines is not less than a threshold value, a dot pattern for an alternate character instead of a dot pattern for the special character, the alternate character being different from the special character, and changes, in a case where the designated character is the alternate character, the dot pattern for the designated character displayed on the display portion to the dot pattern for the special character with a display size that is used in a case where the number of the at least one display line is less than the threshold value.