PURPOSE: To permit measures to be taken quickly against unusual actions by a method in which the opening of automatic door when shop opens is detected in an unmanned cash corner of a bank, etc., and when the door is not opened within a given time period, an anomalous signal is sent out.

CONSTITUTION: When an opening time of shop is reached, a door-opening signal is sent out from an automatic door opening and closing signal transmitter 9 on the basis of signals from a controller 2 to open the automatic door 3. At the same time as shop-opening signal is received, a timer 8 is actuated and after the lapse of a given time period, time-up signal is sent out. The opening of the door 3 is detected by a sensor 4 to send out a signal to an automatic door opening and closing signal receiver 10. When receiving of the signal is later than input of time-up signal, the action of the door 3 is judged to be unusual to send out an anomalous signal from an automatic door anomalous signal transmitter 11.