1. A document processing apparatus which edits an electronic document file containing both an image page and a non-image page, comprising: an editing unit adapted to edit an image page included in an electronic document file; an identifying unit adapted to identify a plurality of image pages from the electronic document file as editing targets of said editing unit; a display unit adapted to display the plurality of image pages, whereby the image pages are distinguished from the non-image pages in accordance with the identifying resulting by said identifying unit, and an applying unit adapted to apply the edit made to the image page included in the electronic document file to the plurality of image pages identified by said identifying unit and displayed by said display unit, and not the non-image pages, when editing processing is performed by said editing unit.