1. A method for matching two documents, a first document data and a second document data, having at least some overlap area, the method comprising the steps of: extracting layout features of the first document data and the second document data, deciding common layout areas of the first document data and the second document data based on the layout features, the common layout area having the same layout in the first document data and the second document data, detecting text data included in the common layout areas of the first document data and the second document data, deciding common text data in the common layout areas of the first document data and the second document data, the common text data having same text data in the common layout areas of the first document data and the second document data, extracting feature points of the common layout areas of the first document data and the second document data based on the common text data, combining the first document data and the second document data according to the feature points.