26. The string matching system of claim 23 , wherein priority scores are respectively given to the plurality of pieces of mapping information stored in each of the phonetic symbol mapping tables, and the phonetic symbol string generation unit calculates matching scores of the phonetic symbol strings into which the input string is converted using the priority scores and determines which of the phonetic symbol strings are to be included in the conversion list with reference to the matching scores.
26. The string matching system of claim 23 , wherein priority scores are respectively given to the plurality of pieces of mapping information stored in each of the phonetic symbol mapping tables, and the phonetic symbol string generation unit calculates matching scores of the phonetic symbol strings into which the input string is converted using the priority scores and determines which of the phonetic symbol strings are to be included in the conversion list with reference to the matching scores. 27. The string matching system of claim 26 , wherein the representative string determination unit determines the representative string included in one of the records included in the candidate list as the output representative string based on the matching scores.