IMAGE PROCESSING DEVICE AND METHOD, IMAGE PROCESSING SYSTEM, AND IMAGE PROCESSING PROGRAM

An image processing device includes: an entire image display control portion that performs control to display an entire image of a predetermined region in an entire image display window; and a cutout image display control portion that performs control to enlarge a plurality of tracking subjects included in the entire image and display the tracking subjects in a cutout image display window. The cutout image display control portion performs the control in such a manner that one cutout image including the tracking subjects is displayed in the cutout image display window in a case where relative distances among the tracking subjects are equal to or smaller than a predetermined value, and that two cutout images including the respective tracking subjects are displayed in the cutout image display window in a case where the relative distances among the tracking subjects are larger than the predetermined value.