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.
6. The language model creation device according to claim 3 , wherein: the language model creating unit is configured to, in a case that the first probability parameter, acquired with respect to a certain target word sequence of the plurality of target word sequences, is larger than a preset upper limit threshold, increase the first probability parameter, acquired with respect to an adjacent target word sequence which is adjacent to the certain target word sequence.