PROBLEM TO BE SOLVED: To provide a program capable of displaying a medical image suited to diagnostic imaging on a display device by a simple operation.SOLUTION: The program causes a computer to function as: an image conversion unit 73 that, when a medical image is displayed as a display image on a display device 31 that can display pixels in luminance in a narrower range than a value range of a gray scale that pixels of the medical image can take, changes a parameter of assigning a part of the value range of the gray scale of the medical image to the value range with the luminance of the display device so as to generate a plurality of display images corresponding to the changed parameter； and a display control unit 74 that causes the display device 31 to sequentially display the plurality of generated display images.
