| 摘要 |
PROBLEM TO BE SOLVED: To improve operability, convenience and visibility at calling time. SOLUTION: This system is composed of a centralized control room master unit 2, which performs calling, speech and alarming to/from room master units 10a to 10c installed in respective dwelling units in plural houses (1 to n houses) 1a to 1n through a centralized controller 4 and a centralized multiple dwelling entrance unit 3, which performs calling and speech call. When an input device 21 inputs the house number of a house where the room master unit of a dwelling unit being an object of speech communication, etc., is installed, the house number is displayed on a house number display part from a house display drive circuit 22, and when the house number button 21b of the input device is operated after confirming it and also the input device inputs the room number of a dwelling unit where the room master device is installed, the room number is shown on a room number display part 25 from a room number display drive circuit 24.
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