Embodiments for providing enhanced ultrasound images without lowering a frame rate in an ultrasound system are disclosed. In one embodiment, the ultrasound system includes: an ultrasound data acquisition unit configured to transmit ultrasound beams to a target object along predetermined plural scan line groups of scan lines in an alternative and sequential manner, receive ultrasound echoes reflected from the target object, and provide a plurality of ultrasound frame data, said predetermined plural scan line groups being respectively associated with predetermined steering angles and each of the plurality of ultrasound frame data being produced in response to the transmission of the ultrasound beam along the respective scan line groups and a processor configured to sequentially form ultrasound images based on the ultrasound frame data and compound the ultrasound images in an interleaving way to form compound images.
