11. The device according to claim 6 , further comprising: a utterance error occurrence adjusting unit configured to adjust the number of occurrences of the utterance error in the entire character string.
11. The device according to claim 6 , further comprising: a utterance error occurrence adjusting unit configured to adjust the number of occurrences of the utterance error in the entire character string. 13. The device according to claim 11 , wherein, when a gap between the word in which the utterance error occurs and a word in which the next utterance error occurs is less than a predetermined value, the utterance error occurrence adjusting unit adjusts the number of occurrences of the utterance error such that the next utterance error does not occur.