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.
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. 7. The method of claim 6 , wherein the unregistered words are retrieved according to a predetermined natural language interpretation method, and the individual name is retrieved according to a regular expression method.