A sound output apparatus is provided. The sound output apparatus includes a memory for storing compensation parameters; an analog interface for being connected to an external audio signal generating device; a signal modem for generating a high-frequency compensation parameter signal according to the compensation parameters if the analog interface is connected to the external audio signal generating device; a signal separator for transmitting the high-frequency compensation parameter signal to the external audio signal generating device, and separating regulated audio signals from the external audio signal generating device according to the high-frequency compensation parameter signal, wherein the regulated audio signals are analog audio signals; and a sound output unit for outputting sounds corresponding to the regulated audio signals.