Included are tracking target setter that sets a person as a tracking target in response to designation by a monitoring person, confirmation video presenter that extracts a video of a moving object with the highest possibility of being the moving object which is the target, based on tracking information, and displays only the videos as confirmation videos, candidate video presenter that displays as a candidate video, a video of a moving object that may be the moving object set as the tracking target is the next highest of the moving object of the confirmation video having an error, where there is an error in the confirmation video, and causes selection of a corresponding candidate video by the monitoring person, and tracking information corrector that corrects the tracking information so that the moving object corresponding to the selected candidate video is associated with the moving object set as the tracking target.
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