A method of obtaining a word set of a patent document is disclosed. The method for obtaining a word set of the patent document may include: obtaining, by a server, a patent document; Obtaining, by the server, a morpheme based on the patent document to obtain a plurality of word sets; Determining, by the server, an error word set from among the acquired plurality of word sets; Modifying, by the server, the error word set; And obtaining, by the server, at least one compound noun phrase set based on a degree of association between the plurality of word sets.
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