Between a first equipment and a second equipment connected to a predetermined bus line, it is arranged that data for setting, etc. on input selection in the first equipment is instructed from the second equipment in the form of command having a predetermined format through the bus line, thus allowing an independent remote control to be performed between the first equipment and the second equipment. Moreover, data on input selection in the first equipment is transmitted to the second equipment, so that, for example, the remote control of the input selection in the first equipment linking with the operation of the second equipment will be performed satisfactorily.