A mobile phone apparatus 10 includes a touch panel controlling IC 30. The touch panel controlling IC 30 controls electric power supplied from the electric power IC 14 on the basis of a received active signal or standby signal to set a touch panel input apparatus 32 to an active state or a standby state on the basis of the received active signal or standby signal. A processor 12 transmits to the touch panel controlling IC 30 the active signal or the standby signal in correspondence with a determined state of the mobile phone apparatus 10.