| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform processing for presenting a specified number of facets in the decreasing order of appearance frequencies in a subset among facets in a corpus at a high speed even when the subset is small as compared with the corpus and while suppressing the capacity of a memory for storing information on the facets.SOLUTION: In a facet counting device 10, a facet division part 34 divides facets into ranges according to appearance frequencies in a corpus, and a sequenced counting list generation part 35 generates a counting list of each range. When the corpus is narrowed down into a subset, a facet counting control part 41 counts facets using a counting list of an (N)-th range, and then quits counting the facets on condition that the top appearance frequency of facets in an (N+1)-th range in the corpus is equal to or lower than the lowest appearance frequency of facets in count results obtained so far.</p> |
