8. The document processing device according to claim 1 , further comprising a storage part for storing therein the format created by said format creating part, or the format corrected by said format correcting part, wherein said character string extracting part reads the format from said storage part, and extracts the character strings from the document data to conform to the read format.
8. The document processing device according to claim 1 , further comprising a storage part for storing therein the format created by said format creating part, or the format corrected by said format correcting part, wherein said character string extracting part reads the format from said storage part, and extracts the character strings from the document data to conform to the read format. 10. The document processing device according to claim 8 , wherein the format stored in said storage part is associated with an attribute of the document data, and said character string extracting part reads the format from said storage part based on the attribute of said document data acquired by said document data acquiring part, and extracts character strings from the document data to conform to the read format.