Embodiments of the present invention provides a chatting system for a virtual pet, including a pet client, configured to receive a natural language sentence of a pet master, and send the natural language sentence to a virtual pet server; the virtual pet server, configured to forward the natural language sentence to a questioning and answering server, and return a natural language response to the pet client; the questioning and answering server, configured to perform processing of natural language understanding on the natural language sentence, obtain language characteristics of the pet master, generate the natural language response according to a natural language understanding result and the language characteristics of the pet master, and return the natural language response to the virtual pet server. Embodiments of the present invention further provide a chatting method for a virtual pet and a questioning and answering server.