Intelligent question and answer system

The invention discloses an intelligent question and answer system. In the system, a content obtaining module is used for confirming and collecting answer-related contents, analyzing and classifying questions of question spaces, and automatically expanding a database; a question analysis module is used for analyzing input question information, determining question types, discovering relationships between the questions, and decomposing the questions; a hypothesis generation module is used for searching for the answer-related contents as reference answers as more as possible in a data source; a soft filtering module performs screening on a large amount of the reference answers to obtain a category of the reference answers which are correct answers very possibly, and a category of the reference answers which are the correct answers possibly; an evidence scoring module performs detailed scoring on the reference answers according to a scoring object and determines a degree of closeness to the reference answers; and