SERVER AND COMMUNICATION SYSTEM

Highly precise detection of occurrence of an abnormality in an out-of-service area is enabled. A server includes an area identification unit A identifying an out-of-service area in which communication with an information communication device is disabled, a determination unit B determining whether the information communication device enters the out-of-service area or not by using the position information of the information communication device a computation unit C calculating an expected stay time in which the information communication device stays in the out-of-service area, and a notification control unit D executing notification processing for notifying predetermined information to a notification destination if it is determined that the information communication device enters the out-of-service area and when an elapsed time from a time when communication with the information communication device is disabled exceeds the expected stay time.