Patent ID: 7113897

Claim:
A text segmentation apparatus comprising: a computer that includes a program comprising program instructions that cause said computer to execute the steps of: (a) calculating a similarity S c,1 at an end of a c th sentence based on a vector created by words that appear in a specified window of a text determined by a number of words, from the end of the c th sentence backward, and based on a vector created by words that appear in the specified window determined by a number of words, from the end of the c th sentence forward, where c=1, 2, 3 . . . N; (b) calculating a likelihood f c,1 at the end of the c th sentence based on a similarity S c−1,1 , a similarity S c,1 , and a similarity S c+1,1 , which corresponds to the end of a (c−1) th sentence, the c th sentence and a (c−1) th sentence; (c) calculating a likelihood f c,k at the end of the c th sentence based on S c−1,k , S c,k , and S c+1,k which are calculated by changing said specified window, where k=1,2,3, . . . L; (d) calculating an overall likelihood F c at the end of the c th sentence based on said f c,k ; and (e) segmenting said text, based on said overall likelihood F c into text segments.