A first interface receives image information and an output destination address from a first external device. A second interface transmits image information to a second external device at a lower communication speed than the first interface. A communication path connects the first interface and the second interface to exchange data, on which a first-in first-out memory is provided. Upon the first interface receiving the address, when the second interface is specified as a transmission destination based on the address, a transmitting unit transmits the image information to the second interface through the communication path and the first-in first-out memory.