Patent ID: 8380713

Claim:
An apparatus for question answering based on answer trustworthiness, comprising: a hardware processor configured to: analyze one or more textual features of documents included in a document collection and measure document trustworthiness for each of the documents based thereon; index documents of which document trustworthiness satisfying a threshold value among documents included in the document collection and stores the indexed documents in one or more knowledge Bases; extract answer candidate documents for a user's question from the one or more knowledge Bases; analyze one or more non-textual features of the extracted answer candidate documents and measure source trustworthiness for each extracted answer candidate document based thereon; analyze an appropriateness of an extraction strategy of the extracted answer candidate documents and measure extraction strategy trustworthiness for each extracted answer candidate document based thereon; and generate an answer candidate trustworthiness list by ranking the extracted answer candidate documents on the basis of document trustworthiness, source trustworthiness, and extraction strategy trustworthiness.