Image processing apparatus, sound processing method used for image processing apparatus, and sound processing apparatus

PURPOSE: An image processing device, a voice processing method thereof, and a voice processing device thereof are provided to clearly recognize a voice in 3D. CONSTITUTION: A signal receiving unit(100) receives an image signal and a voice signal. An image processing unit(200) displays the received image signal. A voice processing unit(400) distinguishes a first channel signal and a second channel signal from the voice signal of each channel. The voice processing unit corrects the first channel signal and the second channel signal based on the energy difference change between the first channel signal and the second channel signal.