According to the present embodiment, the invention enables: a separate input tool to be provided such that a user is able to input a natural language and a mathematical formula; the natural language and the mathematical formula to be structured such that the natural language and the mathematical formula are managed as recombined data on the basis of the analyzed content of data in which the natural language and the mathematical formula are combined; information, which has structured a user query, to be indexed with the natural language and the mathematical formula on the basis of semantic information; the semantic information to be automatically extracted; a complicated sentence, which includes the natural language and the mathematical formula, to be expressed to automatically have a logical relationship; and semantic information to be generated additionally.
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