To shift to a sleep mode only with operation of a dedicated sleep key and to return to a normal mode with operation of any key.

A power saving control unit 1 controls a corresponding device by switching operation state of the device between the normal mode and the sleep mode. A sleep key SW1 receives switch operation between the normal mode and the sleep mode. A first detection unit 7 detects switch operation to the sleep key SW1 and causes the power saving control unit 1 to operate switching between the normal mode and the sleep mode. A second detection unit 9 detects operation to one operation key SW2 under a sleep mode state. When operation to an operation key SW2 is detected by the second detection unit 9 under the sleep mode, the first detection unit 7 controls the power saving control unit 1 by switching, to return to the normal mode.