To provide the utilizing method of a signal for a mobile in terrestrial digital broadcast and to enhance the convenience of a system comprising an apparatus to be controlled and a remote controller.

The television system comprises: the remote controller 1 for transmitting an operation signal in accordance with the user's operation; and a television receiver 2 operated in accordance with the control signal transmitted from the remote controller 1. The remote controller 1 receives the signal for the mobile of the same contents as those of a program received by the television receiver 1 being a controlled system and displays its video image on a display apparatus 33 linked with the television receiver 2. The technology can be applied to television receivers and remote controllers thereof.