There are provided a window setting means for setting a window in a high resolution picture, the window being smaller than the picture; a window moving means for moving the window set by the window setting means at such a predetermined interval that an area in which the window and at least an adjacent window overlap each other exists; an image cutout means for cutting out an image of an area defined by the window, whenever the window is moved; and a picture generation means for generating a large picture by conducting dynamic image processing on images cut out by the image cutout means. By generating an artificial dynamic image, it is made possible to handle a high resolution dynamic picture having a wide area which can be handled almost as a still picture and a frequently changing area, as a dynamic image.