The features of sentences / paragraphs are extracted through the tree pattern expression based matching technique and the natural language processing technique according to one embodiment, and the machine learning technique and the artificial neural network are applied based on the extracted sentence / A method and system for measuring / classifying the level and readability of a document. More particularly, the present invention relates to a sentence legibility classification service that utilizes sentence features, and in a sentence legibility classification service, after extracting features of a sentence defined on the basis of a sentence classification database and learning extracted features, In the paragraph readability classification service that classifies the level and readability of paragraphs and parses the paragraphs based on the paragraph classification database, the paragraphs are parsed in sentence units to extract the characteristics of the paragraphs by combining the features of the defined sentences, By learning the characteristics of a paragraph, it is possible to classify the level and readability of the entered paragraph when entering a new paragraph.
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