Disclosed are a volume adjusting device and an adjusting method thereof for enabling an electronic device such as a TV to perform a volume adjustment operation among operations executable by the electronic device according to a prediction model stored through machine learning based on communication with surrounding devices in a 5G communication environment. According to the present disclosure, when information indicating adjustment of the volume of an electronic device by a user is generated, volume adjustment information may be learned, and the volume may be automatically adjusted to a volume preferred by the user on the basis of the learned information when the user views a video on the electronic device.