| 摘要 |
PROBLEM TO BE SOLVED: To provide a home security system that can enhance the security performance, by transferring only the callings from a registered party. SOLUTION: A doorphone 1, to which a camera 1-1, a microphone 1-2, a ringer button 1-3, and a loudspeaker 1-4 are connected is connected to an electric lamp line 2 by using a power socket for an interface and connected to a gateway 5. Furthermore, a personal computer 4 uses other medium network 3 to connect to the gateway 5. The gateway 5 is connected to the Internet 8 via a modem 6. A mobile phone 7, provided with Internet access function and a system server 9 are connected to the Internet 8.
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