An object of the present invention is to provide a technology for more easily and accurately extracting overall cell regions from a cell morphological image. To achieve the object, first, an acquiring unit acquires a region-identifiable image for identifying a first cell region occupied by a specific portion of a cell in the cell morphological image capturing a shape of the cell using a first display element. Then, an adding unit adds, to the region-identifiable image, a second display element that identifies at least an outline portion of a second cell region occupied by a specific portion different from the first cell region in the cell morphological image depending on a predetermined signal set in advance and input in response to a user's operation. In addition, a correcting unit corrects the region-identifiable image such that the display element that identifies the first cell region is displayed on the display unit for at least a part of the overlapping area where the first and second cell regions overlap each other.