The present invention is to enable a portable telephone capable of switching to a power conservation state so as to reduce power consumption by limiting the supply of power, in which the limit on the supply of power can be partially removed immediately before the portable telephone is used, without the necessity of cancelling the power conservation mode through a mechanical button operation to restore the normal power state. In the case while the supply of power to a predetermined peripheral device (touch panel) is being limited by a power conservation mode, an acceleration sensor detects vibrations applied to the portable telephone as a first state and a brightness sensor detects the ambient brightness of the portable telephone as a second state, a CPU removes the limit on the supply of power to the predetermined peripheral device on the basis of the first state and the second state.