Embodiments for providing an ultrasound system of performing a 3D measurement, comprise: an ultrasound data acquisition unit configured to transmit ultrasound signals to a target object and receive ultrasound echo signals reflected from the target object to acquire ultrasound data a user interface configured to receive input data from a user and a processor configured to form a 3D-ultrasound image based on volume data derived from the ultrasound data, establish two or more points on the 3D-ultrasound image based on the input data, generate connection data among the established two or more points on the 3D-ultrasound image, and measure distances among the established two or more points based on the input data and the connection data.
