3. The language model creation device according to claim 1 , wherein: the language model creating unit is configured to execute the language model creation process on each of a plurality of target word sequences obtained by dividing the speech recognition hypothesis on a border of words.
5. The language model creation device according to claim 3 , wherein: the language model creating unit is configured to, in a case that both the first probability parameter and the second probability parameter are smaller than a preset lower limit threshold, set a value of the first probability parameter and a value of the second probability parameter equal to each other.