In a speedometer control system having wheel speed sensors as well as a vehicle speed sensor, both a PCM and a brake ECU are used to obtain vehicle speeds. Then, a signal corresponding to a vehicle speed is obtained basically from the PCM. However, if it is impossible to properly obtain a signal corresponding to a vehicle speed from the PCM, a signal corresponding to a vehicle speed is obtained from the brake ECU. Accordingly, even in the event that a signal corresponding to the vehicle speed is not obtained from the PCM, it is possible to obtain a signal corresponding to the vehicle speed from the brake ECU, and thus to display the vehicle speed on a speedometer.