This invention returns a page image of a scanned document image to a state before an image correction process by only a simple operation, and facilitates bookbinding work. For this purpose, a plurality of shared folders are set on a network, and attributes in printing are set for the shared folders. A hot folder program supervises the shared folders. When a document image data file scanned by a multifunction apparatus is stored in one of the shared folders, the hot folder program causes an action program to perform a process complying with the attributes set for the shared folder which stores the file, and a bookbinding application to import the file. At this time, when backup in the shared folder is set, an original file stored in the shared folder is backed up in a backup folder. If a bookbinding application designates replacement with a desired page, the page is replaced with a page in the backup folder.