An audio tuning system comprising: an interface configured to provide a test signal to a reference device and to a target device; and a controller configured to acquire a result of audio processing in response to the test signal from the reference device and a result of audio processing in response to the test signal from the target device, compare the results, and adjust an audio processing characteristic value of the target device to match that of the reference device based on a result of the comparison; and characterised by: a storage configured to store test signal information for each of a plurality of audio processing blocks of the reference device and the target device, wherein, the target device comprises a plurality of audio processing blocks (21, 22, 23), the controller is configured to provide, in a sequential manner the target device with a plurality of test signals generated accordingly to the test signal information, acquire results of audio processing in response to the plurality of test signals at the plurality of audio processing blocks (21, 22, 23) of the target device in a sequential manner, independently compare the acquired results of audio processing in each of the audio processing blocks (21,22,23), and adjust, in a stepwise manner, audio processing characteristic values of the plurality of audio processing blocks (21, 22, 23) of the target device, based on a result of the comparing. an interface configured to provide a test signal to a reference device and to a target device; and a controller configured to acquire a result of audio processing in response to the test signal from the reference device and a result of audio processing in response to the test signal from the target device, compare the results, and adjust an audio processing characteristic value of the target device to match that of the reference device based on a result of the comparison; and characterised by: a storage configured to store test signal information for each of a plurality of audio processing blocks of the reference device and the target device, wherein, the target device comprises a plurality of audio processing blocks (21, 22, 23), the controller is configured to provide, in a sequential manner the target device with a plurality of test signals generated accordingly to the test signal information, acquire results of audio processing in response to the plurality of test signals at the plurality of audio processing blocks (21, 22, 23) of the target device in a sequential manner, independently compare the acquired results of audio processing in each of the audio processing blocks (21,22,23), and adjust, in a stepwise manner, audio processing characteristic values of the plurality of audio processing blocks (21, 22, 23) of the target device, based on a result of the comparing. a storage configured to store test signal information for each of a plurality of audio processing blocks of the reference device and the target device, wherein, the target device comprises a plurality of audio processing blocks (21, 22, 23), the controller is configured to provide, in a sequential manner the target device with a plurality of test signals generated accordingly to the test signal information, acquire results of audio processing in response to the plurality of test signals at the plurality of audio processing blocks (21, 22, 23) of the target device in a sequential manner, independently compare the acquired results of audio processing in each of the audio processing blocks (21,22,23), and adjust, in a stepwise manner, audio processing characteristic values of the plurality of audio processing blocks (21, 22, 23) of the target device, based on a result of the comparing.