45. The method of claim 44 wherein the first character set is the Unicode character set and the second character set is a character set for expressing Latin-based language other than the Unicode character set.
44. The method of claim 43 wherein the statistical language models are compiled from the text documents expressed in a first character set, and wherein the process of compiling statistical language models includes the step of mapping source values of the first character set to a group of target values, and wherein the character set in which the series of character values represents text is a second character set distinct from the first character set, and wherein the generating step includes the step of mapping values of the second character set to the same group of target values to which the source values of the first character set are mapped.