The invention relates to an editing of a digital document containing an image, a text, a pattern and the like on pages constituting the digital document. In response to an operation for deleting an image positioned in a page, such image is not added to another page but is moved to and displayed in an evacuation area provided independently from the page area. In the evacuation area, such image is displayed together with a serial number of the page in which such image was present originally. Thus the page layout is not destructed in pages other than the page of image deletion, and the user can easily confirm later the image existed in such page.