A smart hearing method which uses an external processor of a terminal other than an hearing aid in order to reduce cost of a hearing aid, the method comprising: determining an operation mode of a hearing aid; transmitting a received audio signal to the terminal other than the hearing aid when it is determined that the operation mode of the hearing aid is a test mode among a normal mode or a test mode; receiving information related to the test result from the terminal in response to processing the audio signal by the terminal; and setting a control parameter for the hearing aid based on the information related to the test result; wherein the receiving information comprises: activating a near field communication module of the hearing aid in response to processing the audio signal; pairing the hearing aid and the terminal by using the near field communication module; testing with test equipment located in the terminal; and wherein the testing comprises: performing a practice test by playing a practice test sound before an actual test; and confirming whether various external conditions for the actual test are satisfied while playing the practice test sound; wherein the testing comprises: performing the actual test if ambient noise is below a specific value; and setting the specific value below 10dB. determining an operation mode of a hearing aid; transmitting a received audio signal to the terminal other than the hearing aid when it is determined that the operation mode of the hearing aid is a test mode among a normal mode or a test mode; receiving information related to the test result from the terminal in response to processing the audio signal by the terminal; and setting a control parameter for the hearing aid based on the information related to the test result; wherein the receiving information comprises: activating a near field communication module of the hearing aid in response to processing the audio signal; pairing the hearing aid and the terminal by using the near field communication module; testing with test equipment located in the terminal; and wherein the testing comprises: performing a practice test by playing a practice test sound before an actual test; and confirming whether various external conditions for the actual test are satisfied while playing the practice test sound; wherein the testing comprises: performing the actual test if ambient noise is below a specific value; and setting the specific value below 10dB. activating a near field communication module of the hearing aid in response to processing the audio signal; pairing the hearing aid and the terminal by using the near field communication module; testing with test equipment located in the terminal; and wherein the testing comprises: performing a practice test by playing a practice test sound before an actual test; and confirming whether various external conditions for the actual test are satisfied while playing the practice test sound; wherein the testing comprises: performing the actual test if ambient noise is below a specific value; and setting the specific value below 10dB. performing a practice test by playing a practice test sound before an actual test; and confirming whether various external conditions for the actual test are satisfied while playing the practice test sound; wherein the testing comprises: performing the actual test if ambient noise is below a specific value; and setting the specific value below 10dB. performing the actual test if ambient noise is below a specific value; and setting the specific value below 10dB.