Image display apparatus, image display program, image display method, and recording medium for recording the image display program

An operation input unit designates an image to be compared via a thumbnail image or the like. A photographing-information extracting unit extracts, from an image file of the image stored in an image memory, photographing information including the size and the number of pixels of CCD in an image pickup apparatus having captured the image, the distance to an object, and the focusing distance of an image pickup lens. A resizing processing unit automatically enlarges or reduces at least one image to be compared so as to set substantially the same display size of the same object included in a plurality of images, serving as comparison targets, on the basis of the photographing information and display information including resolution of a display, obtained from a display setting unit. A displaying control unit displays the resized image on the display.