According to this invention, a document processing apparatus capable of creating document information including attribute information and page content information from electronic data created by an application program, includes a storage unit which stores, as part of document information, original document information for specifying electronic data as a source of the document information, an update instruction unit which allows a user to instruct regeneration of the document information, and an update unit which creates content information of the document information from electronic data specified by using the original document information and replaces the content information included in the document information with the created content information, in accordance with an instruction issued through the update instruction unit.