An image forming apparatus includes a first control unit configured to control an operation of an image forming unit, and a second control unit configured to be capable of communicating with the first control unit and transmitting information associated with forming an image to the first control unit. The image forming apparatus has a normal operation mode in which an image forming operation is performed, a first power-saving operation mode in which an operation of the first control unit is stopped, and a second power-saving operation mode in which supplying of electric power to the second control unit is stopped. In the first power-saving operation mode, the second control unit determines whether to switch into the normal operation mode from the first power-saving operation mode. In the second power-saving operation mode, the first control unit determines whether to switch into the normal operation mode from the second power-saving operation mode.