An image forming apparatus, a control method, a memory medium, and a program, in which further larger power saving can be accomplished are provided. An N/W interface circuit and a video interface circuit which are constructed so that a communication possible state and a communication impossible state can be independently controlled are provided. Transmission/reception situations of data to/from an external apparatus are monitored and a power supply and a non-power supply of those interfaces are controlled by a control unit, respectively.