APPARATUS, METHOD AND PROGRAM FOR EXTRACTING MAIN PHRASES FOR EACH PERIOD OF TIME

摘要

PROBLEM TO BE SOLVED: To make it possible to confirm the relationship and transition of topics by calculating both main phrases for each period of time and the relating grade between the main phrases.

SOLUTION: In a method according to the present invention, a document aggregate is divided based on the period of time and documents are divided into aggregates of phrases. The statistical information of phrases occurring in titles of the documents of each period of time is accumulated. The statistical information of phrases occurring in the entire text of the documents of each period of time is accumulated. Multiple phrases showing the topics for each period of time are extracted based on the accumulated result of the statistical information of phrases in titles and the accumulated result of the statistical information of phrases in the entire text. Further, the documents including each main phrase are collected and the relating grade between two main phrases is calculated based on the collection result.

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