Provided is an electronic apparatus that prevents leakage of confidential documents and the like that are stored in a storage device. When there is writing of power-supply-mode-switch-request information that is included in a Write request from a user-authenticated portable terminal to an NFC tag, a system-control unit instructs a power-supply-control unit to switch to a normal mode based on the power-supply-mode-switch-request information, and when the portable terminal is separated from the NFC tag, instructs the power-supply-control unit to return to the power-supply mode before the instruction.