Patent ID: 8886255

Claim:
A mobile terminal device comprising: a display section that displays information; a storage section, which includes a storage region divided so as to include a plurality of blocks, and which stores a processing program for internal processes; a communication section that is connectable to a public communication network; and a control section that updates the processing program by acquiring an update program concerning the processing program in the communication section, wherein the storage section stores a plurality of update screens for indicating that the processing program is being updated, wherein the control section displays at least one of the plurality of update screens on the display section and determines whether a predetermined number of blocks of the storage section is changed when updating the processing program, the predetermined number of blocks being greater than one, wherein, when the control section determines that the predetermined number of blocks of the storage section is changed, the control section switches the update screen being displayed on the display section to another update screen, and wherein, when the control sections determines that the predetermined number of blocks of the storage section is not changed, the control section does not switch the update screen being displayed on the display section to another update screen.