1. A photographing unit comprising: an image pickup portion which outputs a first image pickup image obtained through photographing of an object; a display control portion which causes the first image pickup image from the image pickup portion and a second image pickup image from a different photographing unit to be displayed on an identical display screen; an image comparison portion which compares the first image pickup image with the second image pickup image; and an angle-of-view display portion which controls the display control portion on the basis of a comparison result from the image comparison portion to cause a display indicating an image pickup range of the first image pickup image in the second image pickup image to be displayed.