Disclosed is a system for providing chatbot services in an integrated way, in which a client can receive query processing services by immediately accessing at least one of other chatbot servers without changing a preexisting accessing means while being initially connected to a specific chatbot server, so that a user can use a plurality of query processing services without difficulties by linking the chatbot servers operated by the plurality of service providers, thereby minimizing the time, efforts and costs of the user who wants to receive the plurality of query processing services through the plurality of service providers.