12. A method of recognizing an emotion that is executed by an apparatus for recognizing an emotion, the method comprising: generating an input signal from a plurality of heart rate data; finding a group, to which the generated input signal belongs, in a mapping table having prospective input signals classified in groups; and recognizing an emotion of a user corresponding to the found group, wherein the generating of the input signal comprises: receiving the heart rate data in succession, checking whether a current input heart rate differs from a previously input heart rate, and representing an increase or a decrease of the current heart rate in the input signal with a binary form sequence.
16. The method of claim 12 , further comprising receiving feedback of the user about the recognized emotion and reflecting the feedback for the recognizing of the emotion.