PROBLEM TO BE SOLVED: To secure an area community by causing a camera provided in an entrance slave unit of each dwelling unit to always operate, and sharing a photographed video by the area community.SOLUTION: A living room master unit 21 of each dwelling unit 2 belonging to an area community is connected via the Internet 4 to a security server 31 shared by the area community. A camera 12 provided at an entrance slave unit 11 of each dwelling unit 2 always photographs a video around an entrance. The photographed video is transmitted to the living room master unit 21 by the entrance slave unit 11, and transmitted to the security server 31 by the living room master unit 21. The security server 31 stores the video in a storage part 34, and transmits security information to each dwelling unit 2 belonging to the area community as necessary to encourage each resident to pay attention.SELECTED DRAWING: Figure 1
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