Construction method for question and answer system and question and answer processing method and device

The present invention discloses a construction method for a question and answer system. The method is used for solving the problems that in the prior art, when the question and answer system is constructed, knowledge engineers who know the question and answer system need to be depended on, the labor and communication cost required for constructing the question and answer system is greatly increased accordingly, and the construction cost of the question and answer system is high. The method comprises the steps of receiving knowledge points which are input by a user according to a preset binarydecision tree model and aim at a specific domain; determining an association relationship of the knowledge points according to locations of all the knowledge points in the binary decision tree model;generating inference rules of the knowledge points according to all the knowledge points and the association relationship of the knowledge points; storing all the knowledge points and the inference rules of the knowledge point