17. The text data embedding method as recited in claim 11 , wherein each text string is split into a plurality of short text strings at every N number of characters, N being an integer greater than zero.
19. The text data embedding method as recited in claim 17 , further comprising setting N to a first value upon a low resolution being specified for document scanning and setting N to a second value smaller than the first value upon a high resolution being specified for the document scanning.