1. An electronic device for generating an audible system response comprising: a storage configured to store domain information that is categorized for dialogue subjects, and control information for performing tasks corresponding to the dialogue subjects and dialogue patterns for the dialogue subjects a microphone configured to receive a user utterance sound; a speaker configured to output a first audible system response, based on the user utterance sound; and a processor configured to: detect a current domain, among the domain information, based on the user utterance sound received by the microphone; determine one among the current domain and a previous domain as a selected domain to be used to process the user utterance sound received by the microphone, said selected domain being determined based on a first confidence between the user utterance sound and the current domain and a second confidence between the user utterance sound and the previous domain that is used before the current domain to process a previous user utterance sound; and process the user utterance sound to generate the first audible system response with the speaker, based on the selected domain, wherein in response to the current domain being determined as the selected domain, the processor stores information of the previous domain in the storage as interrupted domain information, and after the user utterance sound is processed based on the current domain as the selected domain, the processor controls the speaker to output a second audible system response responding to the previous user utterance sound based on the stored interrupted domain information.