Disclosed is a method of controlling a robot system, the method including a first robot receiving user input including a request for delivery of a predetermined article, the first robot transmitting information based on the user input to a server, the server identifying a supporting robot capable of supporting a task corresponding to the delivery request, the server requesting the task from a second robot identified as the supporting robot, the second robot receiving the article, and the second robot moving to a delivery destination included in the delivery request, thereby improving use convenience through cooperation between the robots.