2. The speech recognition apparatus according to claim 1 , wherein said estimate value calculation unit includes a non-language speech estimation unit operable to calculate, per frame, an estimate value which indicates a degree of likelihood to be a non-language speech of one of the plurality of unnecessary words, using a non-language speech estimate function, and said garbage acoustic score correction unit corrects the garbage acoustic score so as to raise the score by using the estimate value calculated by said non-language speech estimation unit in the frame where the non-language speech is inputted.
2. The speech recognition apparatus according to claim 1 , wherein said estimate value calculation unit includes a non-language speech estimation unit operable to calculate, per frame, an estimate value which indicates a degree of likelihood to be a non-language speech of one of the plurality of unnecessary words, using a non-language speech estimate function, and said garbage acoustic score correction unit corrects the garbage acoustic score so as to raise the score by using the estimate value calculated by said non-language speech estimation unit in the frame where the non-language speech is inputted. 7. The speech recognition apparatus according to claim 2 , further comprising a non-language corresponding character insert unit operable to (i) select at least one of an ideogram and an emoticon corresponding to the non-language speech based on the estimate value estimated by said non-language speech estimation unit and (ii) insert at least either of the selected ideogram and emoticon into the recognition result of said recognition result output unit.