A system including at least one memory, and at least one processor operatively connected to the memory is provided. The memory may store instructions that, when executed, cause the processor to receive an input of selecting at least one domain from a user and store the input in the memory, recognize, at least partially based on data regarding a user utterance received after the input is stored, the utterance, determine, when the utterance does not comprise a domain name, whether or not the utterance corresponds to the selected domain, and generate a response by processing the utterance by using the selected domain when the utterance corresponds to the selected domain.