Disclosed is an image display apparatus that sets a thinning rate, determined according to a designated display magnification ratio, with reference to plural display magnification ratio ranges, and a predetermined thinning rate determined in association with each display magnification ratio range, stores page image data, obtained from an apparatus storing information about the job, into a storage section by thinning page image data, pasts the thinned page image into a frame having a size according to the designated display magnification ratio, and displays the image pasted into the frame. When a display magnification ratio is changed within an identical display magnification ratio range, the image display apparatus pastes, by utilizing page image data according to a thinning rate before the change, the page image after magnifying it to fit into a frame having a size according to a display magnification ratio after the change.