The present invention discolses a wireless television device, a wireless television system and a control method thereof which including a signal transmitter of information packet data for transmitting a control signal to the television set; a signal receiver for receiving the response signal when the television receiving all the picture frame of the information packet data normally; a controller for automatically transmitting the control signal of information packet data when the user does not receive the response signal in a prescribed time. The wireless television device transmits/receives the control signal between the main TV and the sub TV, and automatically transmits the control signal when the signal is not transmitted or received in a prescribed time. |