A multi-sensor camera compares status describing data which is described based on a determining rule and sensor data outputted from a microwave sensor with a notification determining table sent from a processing box. If it is determined that an event is notified, the multi-sensor camera sends notifying image data to the processing box, and presents the sent data on a presenting unit. A user inputs, based on a predetermined detecting condition, the determination on the notification need of the event detected based on the sensor data outputted from the sensor. A unit for learning the determining rule adjusts the predetermined condition used for the detection based on the input determination and the feature of the event, and updates the notification determining table so as to notify the event which needs the notification and prevent the notification of unnecessary event.