Destination management processing units (13,23) of a video processor and a peripheral device each perform destination management processing in a communication between the video processor and the peripheral device. A plurality of communication processing units are situated above the destination management processing unit, respectively correspond to functions of a plurality of peripheral devices, and each process a command. When the destination management processing unit transmits a command, the destination management processing unit adds, to the command to be transmitted, destination information that indicates which of the plurality of communication processing units is to be used. When the destination management processing unit has received a command, the destination management processing unit determines a destination of the received command using destination information added to the received command and distributes the received command to a communication processing unit from among the plurality of communication processing units that is indicated by the destination.
