A remote controller is provided. The remote controller includes a transmitter; a microphone configured to receive an audio signal output from an audio output apparatus; a communicator comprising communication circuitry configured to perform communication with a display apparatus connected to the audio output apparatus and to transmit the audio signal received through the microphone to the display apparatus; and a processor configured to control the transmitter to transmit to the audio output apparatus a signal for controlling a power of the audio output apparatus based on information indicating whether there is a test tone in an audio signal received by the microphone and received from the display apparatus.