| 摘要 |
PROBLEM TO BE SOLVED: To simplify a configuration and wiring and to reduce power consumption. SOLUTION: This system is composed of plural entrance machines 1a and 1b with camera for sending video signals fetched from cameras, a video controller 3 having a switching part 21 for switching which one of entrance machines with camera is to be connected, and a living room monitor 31 having a video display part 31a for displaying the video of video signals from the video controller and the video controller is provided with a switching control part 20 for judging which one of called entrance machines with camera is to be connected by the switching part corresponding to the presence/absence of a DC voltage superimposed on the video signal from the entrance machine with camera.
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