To subject each part to the process suited for it within one image.

The processing range of a data processing part 11 is first set using a command input device such as a mouse or a keyboard. An image of the fundus oculi in an image memory inside the data processing part 11 is displayed on a monitor, etc., and closed areas in which processes are effected while consulting the image are set by use of the command input device. Next, for each of the set closed areas, a processing method, e.g. a negative-to-positive reversing process for making clearer the detail of, e.g. the capillary, is set.