To provide an apartment HA system which confirming a visitor without achieving a call state in response when an interphone in each room receives a call from one in a lobby.

The interphone 2 in the lobby includes an operation means for performing operation to send a voice to a house information board 3 for processing the call, and a control means for forming a call path in an alarm monitoring board 1 by receiving the operation of the operation means and sending the voice inputted through a microphone to the house information board 3 via the call path. The alarm monitoring board 1 has a control means for forming the call path with the house information board 3 for processing the call by receiving the operation of the operation means of the interphone 2 in the lobby. The house information board 3 has a control means for outputting the voice inputted to the interphone 2 in the lobby by a speaker when receiving the voice during time from the call processing from the interphone 2 in the lobby to response.