PURPOSE: To easily and surely confirm intra-dwelling information by eliminating a need of going to the installation place of an intra-information processing unit in a room at the time of confirming various intra dwelling information of a lock-up condition, etc., for the purpose of going out.

CONSTITUTION: This system is provided with an information confirmation switch 10 which is provided in a doorphone slave device 1 or is provided independently of this device 1 and a controller 5 which sends such signal to the doorphone slave device 1 that intra-dwelling information monitored and controlled by intra-dwelling information processing units 3 and 4 are outputted from the doorphone slave device 1 in a form of a voice message or a prescribed warning tone at the time of operation of the information confirmation switch 10.