A server is disclosed. The disclosed server includes a communication device for performing communication with a home appliance and a terminal device, a memory for storing state information of the home appliance and operation pattern information obtained by analyzing an operation pattern of the home appliance, and a processor for, when a query for the home appliance is received from the terminal device, generating response information in response to the received query, and controlling the communication device to transmit the generated response information to the terminal device, wherein the processor extracts a keyword included in the received query, checks at least one state item corresponding to the extracted keyword, and generates response information by using information corresponding to at least one state item in the state information and the operation pattern information.