The present invention may comprise: a step for learning patent documents stored in a patent database by using machine learning technology, establishing a first classification criterion on the basis of the degree of similarity between the patent documents, and generating a basic classification model for classifying the patent documents on the basis of the first classification criterion; a step for generating a patent pool including a plurality of patent documents on the basis of a search and/or selection input of a user; a step for receiving a classification input of the user, and classifying the plurality of patent documents included in the patent pool according to the classification input; a step for predicting a second classification criterion for the user to classify the plurality of patent documents on the basis of the degree of similarity between the classified patent documents; and a step for classifying, on the basis of the basic classification model and the second classification criterion, the remaining patent documents which have yet to be classified in the patent pool.
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