To quickly recognize the correspondence between an identifier identifying an operation object and a device by providing one receiver selected by a selecting means with a transmitting means transmitting data making the user of the receiver execute a prescribed operation for recognizing the selection.

A personal computer 1 makes recorders 2-1 to 2-3 record prescribed data through IEEE 1394 networks 3-1 to 3-3 and reads data recorded in the recorders 2-1 to 2-3. The computer 1 also transmits device selection data for making any of the recorders 2-1 to 2-3 perform a prescribed operation through the networks 3-l to 3-3. It is possible to quickly know the correspondence between an identifier identifying an operation object and a receiver because data for making the prescribed operation for making the user of the receiver recognize the selection is ready to be transmitted.