Abstract: An operation mode control program is a program for carrying out an operation mode changeover control. A user interface section sets time zone corresponding to each operation mode. A time acquire section periodically acquires system time from an internal clock section of an operating system, and transfers the system time to an operation mode changeover section. The operation mode changeover section carries out the operation mode changeover control in accordance with time zone set by the user interface section while receiving the system time from the time acquire section.