PURPOSE: To switch a picture of a television receiver of a house into a picture of a gatedoor camera through a calling of a common gatedoor and to record the picture by a camera to a picture recording section.

CONSTITUTION: When an operation section 4 inputs a house number or the like, a camera 1 is started and an outputted video signal or the like is modulated into a high frequency signal by an RF modulation section and mixed to a common view signal line 11 and sent to a receiver 15 of a house C. Based on the house number, a signal processing section 14 is switched to receive the high frequency signal from an RF modulation section 3 and the receiver 15 is switched to receive a pattern from an RF modulation section 3 via a remote control signal generating section 19. Moreover, a picture recording/reproduction section 2 is operated by the operation of an operation section 20 and a house number and a signal of a picture or the like by the camera 1 in succession thereto is reproduced and the signal processing section 14 of the house is switched similarly to above and a reception channel of the receiver 15 is switched similarly to above and the picture from the picture recording/ reproduction section 2 is displayed.