To remotely control a device in a more user-friendly state by permitting a remote control unit to include an in-control unit transmitter for transmitting a control signal for remotely controlling one device and constituting the in-control unit transmitter to transmit a user identifying signal.

The remote control unit 6 includes the in-control unit transmitter 60 which is connected to an antenna at one side and connected to an in-control unit processor 61 at the other side in order to execute communication with devices 3 and 4 via radio connection 9 and with a controller 5 via signals 70-72 and the processor 61 is connected to an in-control unit memory 62. The transmitter 60 includes an in-control unit receiver and the in-control unit transmitter. When a user operates the remote control unit 6 and depresses a first activation button which indicates the device 1, for example, the in-control unit transmitter transmits the user identifying signal to an in-controller transmitter/receiver 50.