Tracking control is carried out by a push-pull method or by mechanical feed at the time of recording signals, and tracking control is carried out by a phase difference tracking method at the time of reproduction. The intake parameter estimating device basically has a fundamental frequency calculating section, an engine rotational speed detecting section and a tuning frequency calculating section. Each of the antennas receives a separate signal from each of the plurality of satellites over the channels. When the media program is scheduled to play, the media player requests a media broadcasting device to receive the media program; to digitize, transcode, andor transrate the media program, if necessary; and to transmit the media program to the media player. A warning is output to a driver of the vehicle when the driver of the vehicle fails to take over the guidance of the vehicle after the assistance by the parking-assistance device in pulling out of the parking space has ended.