Position information on every moving object is acquired from a moving image of a monitoring area, and activity information during every unit time is acquired from the position information on every moving object. Conditions of an observation period of time are set according to a user input operation, the observation period of time is controlled in accordance with the conditions of the observation period of time, and the activity information during every unit time is aggregated during the observation period of time to acquire the activity information during the observation period of time. An activity map image is generated from the activity information during the observation period of time, and the activity map image and the moving image of the monitoring area are generated and output at every predetermined point in time.
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