3. The textual entailment recognition apparatus according to claim 1 , wherein the combination identification unit calculates a similarity between 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 second text based on the calculated similarities.
3. The textual entailment recognition apparatus according to claim 1 , wherein the combination identification unit calculates a similarity between 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 second text based on the calculated similarities. 4. The textual entailment recognition apparatus according to claim 3 , wherein the combination identification unit performs normalization processing during calculation of the similarity, in accordance with an amount of information of the vector.