An electronic device has, as operation modes, a first mode and a second mode reduced in power consumption from the first mode. The electronic device includes a main unit an operation of which is suppressed in the second mode; and a sub-unit. The sub-unit includes a communicating unit that performs communication via a communication line; and an operation mode controller that changes the operation modes from the second mode to the first mode when the communication with a predefined prescribed device is requested during the second mode and changes the operation modes from the first mode to the second mode at a timing corresponding to termination of the communication.