11. An image processing method, comprising the steps of: storing a first document file; obtaining entered information of the first document file and information on a position of the entered information; storing the obtained information in association with each other; storing a second document file obtained by revising the first document file; extracting a revised area of the second document file based on the first document file corresponding to the second document file and the second document file; obtaining information on a position of the revised area; and correcting the entered information of the first document file, which is stored and corresponding to the information on the position of the revised area, to entered information on the revised area, wherein at least one of the steps is executed using a processor.
11. An image processing method, comprising the steps of: storing a first document file; obtaining entered information of the first document file and information on a position of the entered information; storing the obtained information in association with each other; storing a second document file obtained by revising the first document file; extracting a revised area of the second document file based on the first document file corresponding to the second document file and the second document file; obtaining information on a position of the revised area; and correcting the entered information of the first document file, which is stored and corresponding to the information on the position of the revised area, to entered information on the revised area, wherein at least one of the steps is executed using a processor. 13. The image processing method according to claim 11 , wherein: the first document file and the second document file are obtained by scanning paper documents.