The purpose of the present invention is to provide a method to provide a customized content library service by firstly categorizing content provided from a content providing terminal based on metadata, secondly classifying the content based on a level and the level of difficulty, authenticating the classified content, and verifying the accuracy of classification. The method comprises the steps of: receiving data of a content provider, content, and metadata of the content from the content providing terminal; executing a first classification to categorize the metadata of the content; executing a second classification to classify the metadata of the content based on a level and the level of difficulty; executing reclassification when the error of the second classification is over a preset error range by analyzing the content; analyzing query data of a content search received from a content request terminal; and transmitting a content list of a category corresponding to the query data to the content request terminal by extracting the content list.;COPYRIGHT KIPO 2016
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