Abstract: A question sentence input part of question-answering system inputs a question sentence presented in a natural language. A document retrieval part of the system extracts a keyword from the question sentence and retrieves and extracts the document data including the keyword from a document database. An answer candidate extracting part of the system extracts a language presentation possibly becoming the answer as an answer candidate from the retrieved and extracted document data. An answer type determination part of the system determines an answer type of the answer candidate. An answer table output part of the system classifies the answer candidates by answer type and outputs an answer table listing all or part of the answer candidates having a predetermined evaluation or greater for each answer type in a table format.