Patent ID: 8832484

Claim:
An image forming apparatus comprising: an image forming unit configured to form an image; a power supply controller configured to control the image forming apparatus to operate in a power saving mode, in which supply of power to the image forming unit is cut off, and a normal mode, in which supply of power to the image forming unit is performed, wherein the power supply controller is configured to be switched between the power saving mode and the normal mode; and a plurality of interfaces configured to receive a transition command for transition from the power saving mode to the normal mode, wherein the power supply controller is configured to perform: an interface-power supply process of supplying power to at least one of the plurality of interfaces; and a changing process of, in a case where a predetermined signal is input to an operating interface receiving power in the interface-power supply process in the power saving mode, cutting off power supply to the operating interface and starting power supply to at least one of idle interfaces other than the operating interface.