To enable an external device connected to a video image output device to perform controlling by using the remote controller of the video image output device without providing an extremely complicated configuration.

This system is configured so as to be provided with a means 103b for which the external device 131 connected to the video image output device 20 is designated in a first operation mode, a means 106 for receiving a remote control code peculiar to the external device if the external device is designated, a means 102 for storing the received remote control code, a means 110 for performing communication with the video image output device 20 in a second operation mode to confirm that the device 131 is connected, and a remote control code outputting means 105 for outputting the stored remote control code peculiar to the external device when confirming that the external device 131 is connected.