3. The document analysis system according to claim 2 , wherein the analysis server sends the image processing apparatus a request to additionally send one of the selected pieces of the text data, in a case where the result of the comparison is not greater than or equal to the threshold.
3. The document analysis system according to claim 2 , wherein the analysis server sends the image processing apparatus a request to additionally send one of the selected pieces of the text data, in a case where the result of the comparison is not greater than or equal to the threshold. 4. The document analysis system according to claim 3 , wherein, upon each receipt of the send request, the image processing apparatus sends one of the selected pieces of text data which is selected from a different position on the extracted text data.