In the information process device 1, only when it is determined that the password rewritten in the change password memory area 14a of the backup RAM 14 and the password rewritten in the change password memory area 31a of the second flash memory 31 coincide with each other (S202: YES), the menu display of the liquid crystal display 21 is conducted (S107) and it is permitted to start execution of the application program (S123) based on that the menu M2 of "2. start of game" is selected in the menu display. Further, based on that the menu M1 of "1. set of password" is selected in the menu display (S109: 1), it is permitted input of the change password by touching each of the areas 22c to 22n of the transparent touch panel 22 (S112).