2. The language model creation device according to claim 1 , wherein the transformation rule storage section stores groups each made up of a dialect-containing word string and a standard language-containing word string corresponding to the dialect as the transformation rules, and the dialect language model creation section retrieves the probability of occurrence of the standard language-containing word string from the standard language model and computes the probability of occurrence of the dialect-containing n-grams based on the retrieved probability of occurrence and a pre-configured distribution probability.
2. The language model creation device according to claim 1 , wherein the transformation rule storage section stores groups each made up of a dialect-containing word string and a standard language-containing word string corresponding to the dialect as the transformation rules, and the dialect language model creation section retrieves the probability of occurrence of the standard language-containing word string from the standard language model and computes the probability of occurrence of the dialect-containing n-grams based on the retrieved probability of occurrence and a pre-configured distribution probability. 5. 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 derives transformation patterns that can be utilized as the transformation rules using the extracted dialect-containing word strings and standard language word strings corresponding to the extracted dialect-containing word strings.