PURPOSE: To prevent surely power from being left connected after the end of broadcast by extracting a signal of a prescribed band from a horizontal synchronizing signal so as to confirm the broadcast state and discriminating it as the end of broadcast when a detection signal is not obtained for a prescribed time or over so as to turn off the power.

CONSTITUTION: A synchronizing signal separated by a video detection/amplifier circuit section 31 is separated further into a vertical synchronizing signal and a horizontal synchronizing signal at a synchronous separating section 32. Further, a signal of 15.75kHz is extracted from the horizontal synchronizing signal by a band pass filter 40 and a synchronizing signal detecting circuit 41 monitors the signal of 15.75kHz. On the other hand, an oscillator section 42 is kept oscillated at all times when a power of a TV receiver is supplied so as to drive a counter circuit section 43. Further, when the detection circuit 41 detects a signal, the counter circuit section 43 is kept reset and when the broadcast is finished and the signal is lost, the circuit section 43 makes counts and disconnects power after the count of prescribed number.