1. An image processing method used in an image processing apparatus which includes processing means for processing an image and a display for displaying an image, the image processing method comprising: Using a computer to perform the following steps of: specifying an original image to be processed; displaying a first display image corresponding to the specified original image on an image display area of the display; setting at least one movable or transformable viewer area on the image display area; creating a second display image corresponding to each of the viewer areas by copying a whole of the original image; selecting one of the viewer areas and specifying image processing to be performed on the selected viewer area; performing the specified image processing on the whole of the second display image corresponding to the selected viewer area; replacing the selected viewer area with the second display image after the corresponding image processing; and according to the movement or transformation of the selected viewer area, the result of the image processing is displayed in the selected viewer area and the image before image processing is displayed in the remaining area of the image display area.