In order to adjust the detection sensitivity in the detection of abnormal situations in response to conditions in a monitored location, this sensitivity adjustment device is equipped with an extraction unit and a sensitivity determination unit. With candidate location information (which indicates a candidate location, that is, a location which is close to a monitored location being monitored by the monitoring system, and is a location where an event affecting the degree of congestion of persons or vehicles may occur) used as a key, the extraction unit extracts information pertaining to an event scheduled for the candidate location from a database storing text written in regard to the event. In accordance with a predicted degree of congestion in the monitored location, which is predicted on the basis of the candidate location information and the information pertaining to the event extracted by the extraction unit, the sensitivity determination unit determines the detection sensitivity of the monitoring system in the detection of abnormal situations occurring in the monitored location.