1. A non-transitory computer readable storage medium storing a set of program instructions installed on and executed by a computer, the set of program instructions comprising: displaying a plurality of display images corresponding to respective ones of a plurality of sets of image data; receiving a first instruction and a second instruction, the first instruction indicating selection of a first display image from among the plurality of display images, the first display image corresponding to first image data among the plurality of sets of image data, the second instruction designating an image process; replacing the first display image into a first modified display image, the first modified display image being based on the first image data and the image process; receiving a third instruction indicating selection of a second display image from among the plurality of display images, the second display image being different from the first display image, the second display image corresponding to second image data among the plurality of sets of image data; replacing the second display image into a second modified display image, the second modified display image being based on the second image data and the image process; and replacing, in response to reception of prescribed operation, the first modified display image and the second modified display image respectively into the first display image and the second display image.