The present invention accurately identifies an individual which is present in a certain region. A control section (10) includes: a weight obtaining section (100) configured to obtain a weight； an action information obtaining section (101) configured to obtain action information； a weight change detecting section (102) configured to detect at least one of entrance and exit timings and a stay period； and an individual identifying section (104) configured to identify, based on action information in at least one of the entrance and exit timing and the stay period, an individual which stayed in the certain region.
