To simplify a test for confirming whether each sensor detecting function of a fire, gas leakage, etc., works normally or not in a security device in each dwelling at a multiple dwelling house.

At the time of setting a dwelling number and turning on a switch 8 by a control room master set 1, the signal is loaded on a data signal wire, and a transmission controller 3 sends the signal to the security device 2 at the selected dwelling. The security device 2 in the dwelling simulates the same operation with sensor operation and emits an alarming sound indoors. At this time indoor alarming sound is taken in from the microphone 15 of the same dwelling indoor security device 2 and inputted to the control room master set 1 to hear the alarming sound from transmitter-receiver 24.