ALARM, CONTROL METHOD, AND PROGRAM

An object of the present disclosure is to improve reliability relating to an alert. An alarm (1) is to be installed in a structural component. The alarm (1) includes an apparatus detecting unit (6), a control unit (10), and an alert unit (8). The apparatus detecting unit (6) is configured to detect first information corresponding to an internal event relating to the alarm (1) itself. The control unit (10) is configured to receive the first information to determine the presence or absence of the internal event. The control unit (10) is configured to receive second information relating to an external event that requires emission of an alarm sound to determine the presence or absence of the external event. The alert unit (8) is configured to issue an alert concerning the presence of the internal event and the presence of the external event. The internal event at least includes a time for replacement of the alarm (1). The control unit (10) is configured to cause the alert unit (8) to issue an alert concerning the external event with priority over an alert concerning the time for replacement.