An audio processing method of a television which receives a broadcast signal comprising a received audio signal, the audio processing method comprising: determining if an event for checking an audio quality of the received audio signal has occurred; and if the event for checking audio quality has occurred: playing back the received audio signal of the broadcast signal; displaying a first audio quality setting state corresponding to an audio quality of the received audio while the received audio signal is being played back; performing an audio quality improvement operation for the received audio signal to generate an improved audio signal having the improved audio quality; playing back the improved audio signal after playing back the received audio signal of the broadcast signal, and displaying a second audio quality setting state corresponding to an improved audio quality of the received audio signal while the improved audio signal is being played back, further comprising: repeatedly playing back a plurality of different received audio signals and respective improved audio signals each a respective preset number of times that is preset for each of the plurality of different received audio signals. determining if an event for checking an audio quality of the received audio signal has occurred; and if the event for checking audio quality has occurred: playing back the received audio signal of the broadcast signal; displaying a first audio quality setting state corresponding to an audio quality of the received audio while the received audio signal is being played back; performing an audio quality improvement operation for the received audio signal to generate an improved audio signal having the improved audio quality; playing back the improved audio signal after playing back the received audio signal of the broadcast signal, and displaying a second audio quality setting state corresponding to an improved audio quality of the received audio signal while the improved audio signal is being played back, further comprising: repeatedly playing back a plurality of different received audio signals and respective improved audio signals each a respective preset number of times that is preset for each of the plurality of different received audio signals. playing back the received audio signal of the broadcast signal; displaying a first audio quality setting state corresponding to an audio quality of the received audio while the received audio signal is being played back; performing an audio quality improvement operation for the received audio signal to generate an improved audio signal having the improved audio quality; playing back the improved audio signal after playing back the received audio signal of the broadcast signal, and displaying a second audio quality setting state corresponding to an improved audio quality of the received audio signal while the improved audio signal is being played back, further comprising: repeatedly playing back a plurality of different received audio signals and respective improved audio signals each a respective preset number of times that is preset for each of the plurality of different received audio signals. repeatedly playing back a plurality of different received audio signals and respective improved audio signals each a respective preset number of times that is preset for each of the plurality of different received audio signals.