12. The question and answer server according to claim 11 , further comprising a knowledge base, saving reasoning knowledge, and wherein the reasoning engine unit generates the natural language response according to the natural language understanding result, the language characteristics of the pet master, or the reasoning knowledge.
12. The question and answer server according to claim 11 , further comprising a knowledge base, saving reasoning knowledge, and wherein the reasoning engine unit generates the natural language response according to the natural language understanding result, the language characteristics of the pet master, or the reasoning knowledge. 13. The question and answer server according to claim 12 , wherein the knowledge base stores the reasoning knowledge in a format of a pair of questioning and answering sentences.