LANGUAGE CASE INFERRING DEVICE, LANGUAGE CASE INFERRING METHOD, AND STORAGE MEDIUM ON WHICH LANGUAGE CASE INFERENCE PROGRAM IS DESCRIBED

摘要

PROBLEM TO BE SOLVED: To solve such a problem that the degree of similarity of a detailed natural language including aspect expression of a sentence cannot be calculated and the case including the sentence which is syntactically and semantically similar to a retrieval sentence cannot be retrieved since calculation of the degree of similarity is executed only by using frequency information and category classification of a keyword extracted from the case. SOLUTION: When a keyword is extracted from at least one or more case sentences, a cluster to which each case sentence belongs is decided and a problem solving tree to be characterized by a set of each keyword is generated on the basis of a decision result of the cluster, the cluster to which each case sentence belongs is segmentised on the basis of the attribute of language expression of each case sentence which belongs to each cluster of the problem solving tree.