11. The method of claim 10 , wherein the extracting of a sentence boundary candidate comprises extracting a punctuation mark used in sentence termination as the sentence boundary candidate.
11. The method of claim 10 , wherein the extracting of a sentence boundary candidate comprises extracting a punctuation mark used in sentence termination as the sentence boundary candidate. 12. The method of claim 11 , wherein the extracting of the sentence boundary candidate further comprises extracting sentence-ending elements from endings of predicates as the sentence boundary candidate, the sentence-ending elements being used in the sentence termination.