The present invention is directed to an ultrasound system, which includes a probe to transmit ultrasound signals to a target object and receive ultrasound echo signals from the target object. The probe has an array transducer having multiple transducer elements for generating the ultrasound signals and converting the ultrasound echo signals into electrical signals; and an input unit to receive a swing speed input and form setup information according to the swing speed input. The ultrasound system further includes a body to form an ultrasound image based on the electric signals. The body includes a control unit for generating a control signal in response to the setup information. The probe further has an operation unit to swing the array transducer at a swing speed indicated by the control signal.