A cell type page which displays a fixed number of images at fixed positions with fixed size on a screen and a free type page which displays equal to or more than one image at arbitrary positions with arbitrary size on the screen are provided. In response to an image insertion order in the cell type page, images belong to the cell type pages behind that cell type page are sent astern without influencing positions of images belong to the free type pages behind that cell type image and blank pages are added if there is no blank cells. In response to an image deletion order from the cell type page, images behind an image to be deleted belong to the cell type pages behind that cell type page are closed ahead without influencing positions of images belong to the free type page behind that cell type page and the blank pages are deleted if the blank pages are appeared.