Apparatus for question answering based on answer trustworthiness and method thereof

An apparatus for question answering based on answer trustworthiness, comprising:

• an answer indexer that indexes documents of which document trustworthiness satisfying a threshold value among documents included in a document collection and stores it in a knowledge Bases;
• an answer candidate extractor that extracts answer candidate documents for a user's question from the knowledge Bases;
• an answer source trustworthiness measurement unit that analyzes non-textual features of the answer candidate documents extracted by the answer candidate extractor and measures source trustworthiness for each answer candidate document;
• an answer extraction strategy trustworthiness measurement unit that analyzes the appropriateness of an extraction strategy of the answer candidate documents extracted by the answer candidate extractor and measures the extraction strategy trustworthiness for each answer candidate document;
• and
• a trustworthiness integrator that generates an answer candidate trustworthiness list by ranking the answer candidate documents on the basis of the document trustworthiness, the source trustworthiness, and the extraction strategy trustworthiness of the answer candidate documents.