| 摘要 |
<p>PROBLEM TO BE SOLVED: To output an answer to a question sentence with a small amount of calculation and high accuracy.SOLUTION: A question analysis section 11 analyzes an answer type indicating a type of an answer to a question sentence by classifying the question sentence in a natural language according to an extended named entity system, a document search section 12 acquires a document set retrieved from a document DB 31 by using a word included in the question sentence as a search condition, an answer candidate extraction section 13 extracts an extended named entity corresponding to the analyzed answer type as an answer candidate from extended named entities included in the retrieved document set, and an answer evaluation section 14 calls a feature quantity extraction section 21, extracts a feature quantity from the answer candidate, and outputs a highly reliable answer candidate corresponding to the answer type calculated by inputting the feature quantity to a reliability calculation formula 32 preliminarily constructed in each answer type for calculating reliability of the answer candidate as the answer to the question sentence.</p> |
