1. An information recognition device that recognizes the content of an utterance using a myo-electrical signal of a muscle of a speaker when the speaker is speaking, comprising: myo-electrical signal acquisition means that acquires said myo-electrical signal; activity amount information extraction means that extracts information relating to the activity amount of said muscle from said myo-electrical signal; and information recognition means that recognizes the content of said utterance using information relating to the amount of activity of said muscle.