A generation section generates a first display image based on an image signal output from an image pick-up device, and a second display image based on first and second image signals output from the image pick-up device. An identification section identifies an image region in the second display image generated by the generation section satisfying both a first condition and a second condition. The image region identified by the identification section is then displayed so as to be distinguishable from other regions in the second display image. The first condition indicates a condition of the magnitude of contrast being a first specific value or greater, and the second condition indicates a degree of matching between the first image and the second image being a second specific value or greater.