A system, a user terminal, a method of the system, a method of the user terminal, and a computer program product are provided. The system includes a communication interface, at least one processor operatively coupled to the communication interface, and at least one piece of memory operatively coupled to the at least one processor, wherein the at least one piece of memory is configured to store instructions configured for the at least one processor to receive sound data from a first external device through the communication interface, obtain a voice signal and a noise signal from the sound data using at least some of an automatic voice recognition module, change the voice signal into text data, determine a noise pattern based on at least some of the noise signal, and determine a domain using the text data and the noise pattern when the memory operates.