System for processing user utterance and controlling method thereof

A system includes a communication interface, at least one processor, and at least one memory storing information about a plurality of chatbots and a plurality of categories of the chatbots. The memory may further store instructions that, when executed, cause the processor to receive from a client device including a user interface (UI), data associated with a voice-based or text-based user input associated with or indicative of a request to perform at least one task, to select at least one chatbot from the plurality of chatbots for at least one category for performing the at least one task among the plurality of categories of the plurality of chatbots, and to transmit information on the selected at least one chatbot and the at least one category via the communication interface to the client device such that the client device provides the information through the UI.