Regarding a predetermined area where a plurality of personnel can enter and exit through a plurality of gates, the positional relationship between the respective positions of the plurality of personnel and the plurality of gates is determined in accordance with the timing of exiting from the predetermined area of each of the plurality of personnel. Based on the plurality of gates, a gate to be used when a plurality of personnel exits from each predetermined area is determined, and for each of the plurality of gates, information on personnel exiting from the predetermined area is generated and generated. Information to be notified.
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