1. In an image stitcher for arranging a plurality of images to be stitched in m rows and n columns (m and n are natural numbers) on a monitor screen such that their respective arrangement positions conform to an actual relative positional relationship, to stitch all the images utilizing information related to the arrangement position of each of the images, the image stitcher comprising: means for displaying on the monitor screen an image arrangement pattern selection screen including a plurality of types of image arrangement patterns for arranging the plurality of images to be stitched in m rows and n columns on the monitor screen; means for causing a user to select one of the plurality of types of image arrangement patterns on the image arrangement pattern selection screen; and means for arranging the plurality of images to be stitched in m rows and n columns on the monitor screen in accordance with the image arrangement pattern selected by the user.