An interactive server and a controlling method thereof are provided. The method of controlling an interactive server includes receiving data corresponding to a user voice from a user terminal, determining an utterance type of the user voice, in response to determining that the utterance type of the user voice is an integrated utterance type, generating a search response and a chatting response in response to the user voice and generating an integrated response by combining the generated search response and the generated chatting response, and transmitting the generated integrated response to the user terminal.