According to an embodiment of the present invention, a method of providing online education service by server for providing online education service may comprise: a step wherein the server for providing online education service maintains a question database in which one or more question items, one or more answer guide items corresponding to each of the question items, and one or more answer keywords corresponding to each of the answer guide items are recorded; a step wherein the server for providing online education service provides a learner with the one or more question items and displays one or more answer guide items corresponding to the question item selected by the learner; a step wherein the server for providing online education service displays one or more answer keywords corresponding to the one or more answer guide items respectively, and ask the learner to input answer sentences corresponding to each of the answer keywords which the learner has selected for each of the answer guide items; a step wherein the server for providing online education service corrects respectively one or more answer sentences which the learner has inputted corresponding to each of the answer keywords for each of the answer guide items; and a step wherein the server for providing online education service completes an answer text corresponding to the question item selected by the learner, by guiding the arrangement between the one or more corrected answer sentences.
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