To prevent a cable for connecting on-vehicle electronic equipment together from being extended and pulled around.

A CD tuner part 1 and an MD changer 3 are connected by a bus 6, the MD changer 3 and a navigation unit 4 are connected by a bus 8, and control information and an information signal such as an audio signal are enabled to transmit and receive bidirectionally between the CD tuner part 1, the MD changer 3 and the navigation unit 4. To a general-purpose input/ output terminal 13 provided with the MD changer 3, a rear commander 5 is connected, and to a general purpose input/output terminal 14 of the navigation unit 4 is connected a power antenna unit. A signal for controlling the power antenna unit is supplied to a power antenna unit 9 by way of the general-purpose input/output terminal 14 and control information generated from the rear commander 5 is fetched by way of the general-purpose input/output terminal 13.