| 摘要 |
An information retrieval device (1) for retrieving information related to a word includes: an input unit (11) for inputting a word; a pattern generation unit (13) which, upon input of a new word after input of a given number of words, generates a word group in a case of adding the new word to a previously input word and a word group in a case of replacing a previously input word with the new word; an occurrence information derivation unit (14x) which, for each of the word groups generated, derives occurrence information corresponding to a probability of occurrence of the word group; and a determination unit (15) which determines a word group to be used in new retrieval, based on the derived occurrence information. |
