An ultrasound system, comprising: an ultrasound data acquisition unit configured to set at least two focal points, wherein the at least two focal points are set at different locations respectively, and form ultrasound data corresponding to the respective at least two focal points by considering transmission delays to the respective at least two focal points; and a processor configured to form vector information of a target object by using the ultrasound data, wherein the ultrasound data comprises vector information including different velocities and directions of the target object, wherein a first focal point of the at least two focal points is set in a transmission direction of the ultrasound signal from the transducer elements, wherein a second focal point of the at least two focal points is set in an opposite transmission direction of the ultrasound signal from the transducer elements, and wherein the ultrasound data acquisition unit is configured to: set transmission delays corresponding to the respective at least two focal points considering distances between the respective transducer element and the at least two focal points; form transmission pulses corresponding to the respective at least two focal points by considering the transmission delays; transmit a plurality of ultrasound signals into the target object in response to the transmission pulses and receive ultrasound echoes to form a plurality of receive signals; perform analog-to-digital conversion upon the plurality of receive signals to form a plurality of digital signals; perform reception beam forming upon the plurality of digital signals to form a plurality of receive-focused signals; and form the ultrasound data corresponding to the respective at least two focal points by using the plurality of receive-focused signals. an ultrasound data acquisition unit configured to set at least two focal points, wherein the at least two focal points are set at different locations respectively, and form ultrasound data corresponding to the respective at least two focal points by considering transmission delays to the respective at least two focal points; and a processor configured to form vector information of a target object by using the ultrasound data, wherein the ultrasound data comprises vector information including different velocities and directions of the target object, wherein a first focal point of the at least two focal points is set in a transmission direction of the ultrasound signal from the transducer elements, wherein a second focal point of the at least two focal points is set in an opposite transmission direction of the ultrasound signal from the transducer elements, and wherein the ultrasound data acquisition unit is configured to: set transmission delays corresponding to the respective at least two focal points considering distances between the respective transducer element and the at least two focal points; form transmission pulses corresponding to the respective at least two focal points by considering the transmission delays; transmit a plurality of ultrasound signals into the target object in response to the transmission pulses and receive ultrasound echoes to form a plurality of receive signals; perform analog-to-digital conversion upon the plurality of receive signals to form a plurality of digital signals; perform reception beam forming upon the plurality of digital signals to form a plurality of receive-focused signals; and form the ultrasound data corresponding to the respective at least two focal points by using the plurality of receive-focused signals. set transmission delays corresponding to the respective at least two focal points considering distances between the respective transducer element and the at least two focal points; form transmission pulses corresponding to the respective at least two focal points by considering the transmission delays; transmit a plurality of ultrasound signals into the target object in response to the transmission pulses and receive ultrasound echoes to form a plurality of receive signals; perform analog-to-digital conversion upon the plurality of receive signals to form a plurality of digital signals; perform reception beam forming upon the plurality of digital signals to form a plurality of receive-focused signals; and form the ultrasound data corresponding to the respective at least two focal points by using the plurality of receive-focused signals.