1. A speech recognition method comprising: sensing a change of position of at least one part of a human body, the sensing being performed by a gyroscope, wherein the gyroscope senses said change in position through physical contact with said at least one part of the human body; selecting, by a controller, a speech recognition set based on the change of position, the speech recognition set specifying a set of words to be recognized, wherein when the gyroscope indicates that at least one part of the human body is in a first position, a first speech recognition set is selected to recognize a first set of words, and wherein when the gyroscope indicates that the at least one part of the human body is in a second position, a second speech recognition set is selected to recognize a second set of words different from the first set of words; receiving a speech input signal; and recognizing the speech input signal in the context of the selected speech recognition set, the recognizing resulting in a recognition result.