An editing processor includes a storage unit to store a document file that includes an object group in which objects are arranged according to an implementation order at each page of an electric document, a reading unit to read the object group from the storage unit in response to a read request for a target page of the electric document, an encapsulation processing unit to encapsulate a graphics object in the object group in response to an information input of the graphics to be added, and an editing unit to generate a graphics object from the information of the graphics and to add the generated graphics object to a position following the end of the object group arranged according to the implementation order in response to the encapsulation of the graphics object.