It provides a question-and-answer system based on dialogue reconstruction. The dialog reconstruction-based question and answer system according to the present invention includes a user interface that receives a query from a user through a network and transmits a response to the query to the user, and generates a processed query by performing natural language analysis and classification for the query A query processing module, a query transformation learning unit including a query transformation model generated through a sequence-to-sequence model, and a query transformed by performing transformation on the processed query with reference to the query transformation model A query transformation module that generates , and a similarity calculation module that calculates the similarity between the processed query and the transformed query. and an answer generating module that generates a response to the query from the transformed query.
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