1. An ultrasound system, comprising: an ultrasound data acquisition unit including an ultrasound probe and configured to acquire ultrasound data corresponding to at least one ultrasound image; a storage for storing a plurality of beam profiles respectively corresponding to a plurality of focusing points, each of the plurality of beam profiles indicating a spreading degree of an ultrasound beam according to depth based on the corresponding focusing point; and a processing unit including a microprocessor and configured to extract a beam profile corresponding to a focusing point among the plurality of beam profiles, set an amount of blurring corresponding to spreading of the ultrasound beam according to a depth for the at least one ultrasound image based on the extracted beam profile, the processing unit being further configured to perform a filtering process for compensating the blurring by the spreading of the ultrasound beam based on the ultrasound data and the set amount of blurring to enhance quality of the at least one ultrasound image.