1. A method for changing a magnification of an image comprising the steps of: dividing the image into a number of divisional images; magnifying the divisional images; and combining the magnified divisional images, wherein, for a magnification in a range of (1, 2) or (1/2, 1), the image is divided into the divisional images such that each divisional image has a number of pixels which causes the number of pixels in a one-dimensional direction of the magnified or reduced image to be increased or decreased by one.