1. An ultrasound system, comprising: an ultrasound data acquisition unit configured to perform a transmit/receive operation including transmitting ultrasound signals to a target object and receiving ultrasound echoes reflected from the target object to thereby acquire multiple ultrasound data; and a processing unit configured to form entropy information based on the multiple ultrasound data and to adaptively perform data processing for image enhancement upon the multiple ultrasound data based on the entropy information, the processing unit being further configured to form multiple ultrasound images based on the multiple ultrasound data with the data processing performed.