4. The language model creation device according to claim 2 , further comprising a transformation rule processing section that extracts dialect-containing word strings from the dialect data and modifies the transformation rules on the basis of the extracted dialect-containing word strings, and wherein the transformation rule storage section updates the already stored transformation rules using the transformation rules modified by the transformation rule processing section.
4. The language model creation device according to claim 2 , further comprising a transformation rule processing section that extracts dialect-containing word strings from the dialect data and modifies the transformation rules on the basis of the extracted dialect-containing word strings, and wherein the transformation rule storage section updates the already stored transformation rules using the transformation rules modified by the transformation rule processing section. 6. The language model creation device according to claim 4 , wherein, in case no transformation rules are stored in the transformation rule storage section, the transformation rule processing section extracts, from the dialect data, word strings that are not included in the standard language model among the word strings contained therein and creates the transformation rules using the extracted word strings.