20. The computer-readable recording medium storing the program according to claim 19 , wherein the model based topic segmentation processing outputs a segmentation confidence, representing the degree of certainty of segmentation of the text, to at least one interval obtained on segmenting the text in association with a topic, the parameter estimation processing estimating the parameter used in the change point detection topic segmentation processing, in an interval of a higher value of the segmentation confidence, using the result of segmentation by the model based topic segmentation processing as training data.
19. A computer-readable recording medium storing a program causing a computer that performs segmentation of a text into a plurality of intervals, to execute: a model based topic segmentation processing that references a topic model storage device that stores a topic model representing semantic coherence, segments the text in association with the topic, with the aid of the topic model; a parameter estimation processing that estimates a parameter, using a result of segmentation of the text by the model based topic segmentation processing as training data, the parameter being used in segmenting the text based on detection of a change point in word distribution in the text; and a change point detection topic segmentation processing that segments the text based on detection of a change point of word distribution in the text, using the parameter estimated in the parameter estimation processing.