5. The method of claim 1 , wherein the verifying of the unregistered words and the determining of the semantic classes of the verified unregistered words comprise: generating a search word for the unregistered words and performing a search through a searching unit; extracting usage examples of the unregistered words from the search for the search word; verifying the unregistered words with the usage examples according to a predetermined unregistered word verification method; and determining the semantic classes of the unregistered words among candidate semantic classes of the unregistered words according to the usage examples.
6. The method of claim 5 , wherein according to the unregistered word verification method, an individual name having ratios of the frequency values of each word forming the individual name to the frequency value of the individual name in a usage example of an unregistered word, exceeding a threshold is verified as an unregistered word.