METHOD, DEVICE, AND PROGRAM FOR EXTRACTING FEATURE WORD

摘要

PROBLEM TO BE SOLVED: To extract feature words being in common with concepts of intermediate hierarchy and lower as feature words in topics of the intermediate hierarchy of a hierarchical topic model.SOLUTION: An object component model extraction part 12 extracts an object component model 24 of a topic k as an object from a hierarchical topic model 22. A same-order hierarchy component model extraction part 14 extracts a same-order hierarchy component model group 26 of the topic k. A lower hierarchy component model extraction part 16 extracts a lower hierarchy component model group 28 of the topic k. A score calculation part 18 calculates a score of all words included in the object component model 24 taking account of dispersion in the topic of the lower hierarchy and dispersion in the topic of the same-order hierarchy. A feature word extraction part 20 extracts feature words in the topic k on the bases of the score of each word.