To provide the system rich in information amount and capable of announcing the information of the various kinds of facilities.

Environment information related with the environment of a building is announced by a central monitoring device 10. Moreover, a massage display board 20 for announcing the same information as the environment information is arranged in the building. In the central monitoring device 10, the identification information of the message display board 20 on which the information should be displayed among each announcing device is added to the identification information, and transmitted. In each message display board 20, the information is announced when the identification information added to the received information is matched with the identification information of its own device.