1. A method for video indexing based on viewers' behavior and emotion feedback, comprising: monitoring one or more viewers during a multimedia sequence play back; detecting the one or more viewers' behavior and emotion feedback; categorizing the one or more viewers' behavior and emotion feedback as a plurality of categories of behavior and emotion segments; and indexing the multimedia sequence using the plurality of categories of behavior and emotion segments, wherein a user can selectively view the multimedia sequence using the plurality of categories of behavior and emotion segments as video indices.