| 摘要 |
PROBLEM TO BE SOLVED: To extract not only a momentarily warming-up topic targeting text data, but also a topic which warms up continuously in real time among topics which warm up continuously.SOLUTION: A topic extraction device 10 includes a syntax analysis portion 13 which extracts words indicative of a topic from a plurality of documents, a warming-up value generation portion 16 which determines whether the words are determined as words indicative of a topic newly warming up in a determination period traced back from an object period in which warming-up is determined, sets a reference period according to the determination, and counts frequencies of appearance of the words in the object period and reference period, and a grouping portion 18 which determines whether the words are words indicative of the warming-up topic based upon the frequencies of appearance. |
