A method of determining behavior of a emotional model device and an emotional model device is disclosed. According to one aspect of the present invention, an emotional model device has an emotional element of trait, attitude, mood, and emotion. The emotion model device updates the emotion periodically or when there is an external stimulus, and determines the behavior based on the updated emotion. The emotion can be updated depending on the tendency, attitude, and mood, and the configuration for updating the emotion and the configuration for conveying the updated emotion may be configured as a separate processing module, process, or thread .
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