23. The computer-readable recording medium storing the program according to claim 20 , wherein the model based topic segmentation processing outputs the segmentation confidence of a higher value for an interval in the text regarding a topic represented by any one of topic models stored in the topic model storage device, and outputs the segmentation confidence of a lower value for an interval in the text regarding a topic associated with an none of topics represented by topic models stored in the topic model storage device.
23. The computer-readable recording medium storing the program according to claim 20 , wherein the model based topic segmentation processing outputs the segmentation confidence of a higher value for an interval in the text regarding a topic represented by any one of topic models stored in the topic model storage device, and outputs the segmentation confidence of a lower value for an interval in the text regarding a topic associated with an none of topics represented by topic models stored in the topic model storage device. 24. The computer-readable recording medium storing the program according to claim 23 , wherein the model based topic segmentation processing decides that an interval matched to a garbage model not representing a specified topic or topics in the text is an interval relevant to a topic associated with none of topics represented by topic models stored in the topic model storing processing, and outputs the segmentation confidence at a lower value for the interval.