1. An apparatus for speech recognition, comprising: an acoustic processor, wherein said acoustic processor converts analog speech input signals into digital signals; a first storage structure, wherein said first storage structure stores an acoustic model which has learned voice characteristics; a second storage structure, wherein said second storage structure stores a dictionary containing a first language model which has been trained regarding disfluency words and non-disfluency words, and a second language model which has been trained regarding non-disfluency words and trained to ignore disfluency words; and a probability calculator, wherein said probability calculator calculates a probability regarding said digital signals using said acoustic model and said dictionary to recognize words showing the highest probability of representing said input signals.