Embodiments for providing a plurality of 3-dimensional ultrasound images in an ultrasound system are disclosed. The ultrasound system includes: an ultrasound data acquisition unit configured to acquire a first ultrasound frame data set from a target object a processing unit configured to form a 2-dimensional ultrasound image based on the first ultrasound frame data set and a user input unit for allowing a user to input user input information, wherein the processing unit is further configured to set a plurality of regions of interest (ROIS) in either a multiple ROI setting way or a single ROI setting way based on the user input information, wherein the ultrasound data acquisition unit is further configured to acquire a plurality of second ultrasound frame data sets according to the setting of ROIS, and wherein the processing unit is further configured to form multiple 3-dimensional ultrasound images corresponding to the respective ROIS.
