A car audio apparatus forms a piconet together with information terminals
that can communicate information with the car audio apparatus using a BT
radio communication system so that information can be communicated in the
piconet, acquires the attribute information of each information terminal
that can communicate information with the car audio apparatus, and
determines and collects music files that can be played in the car audio
apparatus based on the attribute information. A list of the obtained
music files is displayed on a display section of the car audio apparatus.