1. A human nervous system-based emotion synthesizing apparatus, comprising a stimulus sensor portion having at least a stimulus sensor for sensing an external stimulus; an emotion generator for generating an predetermined emotion corresponding to the sensed external stimulus; a physiological signal generator for generating at least one artificial physiological signal in response to the sensed stimulus and the generated emotion; and an emotional behavior generator for generating at least one emotional behavior through a predetermined physical reaction in response to the sensed stimulus and the generated emotion, whereby the generated artificial physiological signal is fed back to the emotion generator and the emotional behavior generator, and the generated emotional behavior is fed back to the emotion generator and the physiological signal generator so that the emotion, the artificial physiological signal and the emotional behavior are combined to produce and express a complex emotion