1. An apparatus for emotion recognition, the apparatus comprising: a frame parameter generator configured to detect a plurality of unit frames from an input speech and to generate a parameter vector for each of the unit frames; a key-frame selector configured to select a unit frame as a key frame among the plurality of unit frames; an emotion-probability calculator configured to calculate an emotion probability of each of the selected key frames; and an emotion determiner configured to determine an emotion of a speaker based on the calculated emotion probabilities.