1. A home security system that monitors an inside of a facility comprising: a plurality of detection units operable to detect an alarming situation in different locations inside the facility; a plurality of image capturing units operable to capture an image in different locations inside the facility; an association memory unit operable to memorize associations between a plurality of the detection units and a plurality of the image capturing units; an updating unit operable to update the associations memorized in the association memory unit; and a control unit operable to, when one of a plurality of the detection units detects an alarming situation, have the image capturing unit which is associated with the detection unit that detects the alarming situation capture an image based on the associations memorized in the association memory unit.