9. A method for performing region segmentation processing on a document image, the method comprising: using a processor to perform the steps of, acquiring a document image; segmenting the acquired document image into a plurality of regions; detecting a text region including an erroneous sentence from the segmented regions; detecting a second attribute region partly overlapped with an original sentence of the erroneous sentence; separating the detected region into the second attribute region and a part of the original sentence; and combining the separated part of the original sentence with the text region including the erroneous sentence.
10. The method according to claim 9 , further comprising displaying the segmented regions.