5. The textual entailment recognition apparatus according to claim 1 , wherein the entailment determination unit obtains, for each of the combinations, one of a degree of word coverage and a degree of word matching for only the word serving as the argument between the predicate-argument structure of the first text and the predicate-argument structure of the second text, as the feature amount, based on a word other than a word indicating the type of argument of a predicate in the predicate-argument structure.
1. A textual entailment recognition apparatus for determining whether a first text entails a second text, comprising: a vector generation unit that generates, for each of the first text and the second text, a vector for each predicate-argument structure of the first text and the second text by using a word other than a word indicating a type of argument of a predicate in the predicate-argument structure; a combination identification unit that compares the vector generated for each predicate-argument structure for the first text and the vector generated for each predicate-argument structure for the second text, and identifies combinations of the predicate-argument structures of the first text and the predicate-argument structure of the second text based on a result of the comparison; and an entailment determination unit that obtains a feature amount for each of the identified combinations, and determines whether the first text entails the second text based on the obtained feature amounts.