Computer-readable non-transitory recording medium having software update program recorded thereon, and software update apparatus

A computer-readable non-transitory recording medium having a software update program recorded thereon, the software update program being configured to cause a computer to act as:

• an update instruction unit that instructs an electronic apparatus to update software;
• and
• a method selection unit that selects a method that requires a shorter time, from a normal update method in which the electronic apparatus receives renewed software and updates current software to the renewed software, and an incremental update method in which the electronic apparatus (i) receives difference data representing a difference of the renewed software with respect to the current software, and (ii) applies the difference data to the current software thus to update the current software to the renewed software,
• wherein the update instruction unit instructs the electronic apparatus to update the software by the normal update method when the method selection unit selects the normal update method, and instructs the electronic apparatus to update the software by the incremental update method when the method selection unit selects the incremental update method.