15. The computer system according to claim 14 , wherein the emotion categories comprise at least a lasting emotion category, a short-lived emotion category and a momentary emotion category.
15. The computer system according to claim 14 , wherein the emotion categories comprise at least a lasting emotion category, a short-lived emotion category and a momentary emotion category. 16. The computer system according to claim 15 , wherein the validity time period of the momentary emotion category is determined by an unexpected response index generated by the social response generator.