7. The image processing apparatus of the claim 6 , wherein the image processing apparatus further comprises an image reading unit which obtains the first document data and the second document data.
7. The image processing apparatus of the claim 6 , wherein the image processing apparatus further comprises an image reading unit which obtains the first document data and the second document data. 8. The image processing apparatus of the claim 7 , wherein the image reading unit is an image scanner which scans original documents and obtains the first document data and the second document data.