An image display apparatus including a first storage means for storing at least one item of image data, correction condition data for correcting the image data, and corrected image data obtained after the image data is corrected on the basis of the correction condition data; an image processing means for producing the corrected image data; a display means comprising a screen for superimposing an original image based on the image data and a corrected image based on the corrected image data onto each other and displaying either the original image or the corrected image; an input means for selecting an image to be displayed on the display screen, and a display control means for switching between the images in response to an input from the input means, so that either the original image or the corrected image is displayed on the display screen.