Activity information acquirer that acquires activity information representing an activity level of a moving object for each of a plurality of predetermined detection elements acquired through division performed on a captured image, a target area setter that sets a target area on a facility map image acquired by drawing a layout on the inside of the facility, an indexed information generator that generates indexed information acquired by indexing the activity state of the moving object in the target area on the basis of the activity information, an activity state display image generator that generates a digest image representing an overall activity state of the moving object in the target area on the basis of the indexed information, and an output information generator that generates output information which includes display information acquired by superimposing an activity state display image on the facility map image.