PURPOSE: To improve both the usability and the functionality, by adding a remote control function of a master TV to a slave TV which can be attached/ detached to the master TV.

CONSTITUTION: A housing 18 of a master TV contains a slave TV attaching part 16, the terminals 19 for power supply, antenna signal and switch control respectively, and a photodetector 17. Thus a slave TV 20 can be attached to the master TV. While the housing 1 of the TV20 includes a screen 2, a control part 3, a remote control part 4, a loudspeaker sound discharging hole 5, a remote control display part 6, an external power supply connecting terminal 7, an external antenna connecting terminal 8, a connection switching terminal 9, an antenna 10, and a light emitting diode. Said device is usable as a TV by operating the control part 3, and at the same time, the remote control is possible for the master TV through the control part 4.