1. A speech recognition system that recognizes speech data, the speech recognition system comprising: a speech recognition part that performs speech recognition of the speech data, and calculates a likelihood of the speech data with respect to a registered word that is pre-registered; a reliability judgment part that performs reliability judgment on the speech recognition based on the likelihood; and a judgment reference change processing part that changes a judgment reference for the reliability judgment, according to an utterance speed of the speech data.
1. A speech recognition system that recognizes speech data, the speech recognition system comprising: a speech recognition part that performs speech recognition of the speech data, and calculates a likelihood of the speech data with respect to a registered word that is pre-registered; a reliability judgment part that performs reliability judgment on the speech recognition based on the likelihood; and a judgment reference change processing part that changes a judgment reference for the reliability judgment, according to an utterance speed of the speech data. 6. The speech recognition system according to claim 1 , wherein the judgment reference change processing part determines the utterance speed.