The present disclosure relates to an image processing device, an operation method of the image processing device, and a computer-readable recording medium. The image processing device according to an embodiment in the present disclosure may comprise: a voice-obtaining unit for obtaining the voice of a user and generating a first voice signal; a communication interface unit for receiving a second voice signal of the user from an external device; and a processor which, after the first voice signal is received from the voice-obtaining unit, performs a first pre-processing operation employing voice amplification of the received first voice signal, and, after the second voice signal is received via the communication interface unit, performs a second pre-processing operation employing noise amplification of the second voice signal.