A driving device (2) which is remotely controlled by a transmitter (1) holds a first parameter (D) and a second parameter (L), transmits an offense signal based on the first parameter (D), and changes the second parameter (L) according to information included in a received specified signal. A remote control system can realize a battle game where the transmitter (1) and the driving device (2) play against another pair of a driving device (2) and a transmitter (1), the driving device (2) receives the offense signal transmitted from the other driving device (2) as the specified signal, and the second parameter (L) is changed according to the information included in the specified signal can be realized in a remote control toy system. In the system, the transmitter (1) allows a control signal to include specified information according to a user's specified operation, and the driving device (2) changes the its own first parameter (D) based on the specified information in the control signal.