12. The string matching method of claim 9 , wherein the determining the representative string comprises determining a representative string included in one of the records included in the candidate list as the output representative string based on the matching scores.
13. The string matching method of claim 12 , wherein the determining the representative string further comprises: if none of the phonetic symbol strings included in the candidate list exceed a reference value, determining the input string as the output representative string, and, if the input string is determined as the output representative string, the storing the input string and the output representative string in the previous results database further comprises storing the input string in the representative list DB together with the phonetic symbol string with a highest matching score among the phonetic symbol strings included in the candidate list.