An ultrasound system of forming ultrasound data, comprising: an ultrasound data forming unit having a plurality of receive channels wherein the ultrasound data forming unit is configured to perform the functions of: A. storing data provided from the receive channels in a first data storing unit; B. receive-focusing the data based on receive delay curve lookup tables to form scan line data corresponding to each of receive scan line to be simultaneously formed in a single transmission of ultrasound signals; C. setting a storing start position on a second data storing unit having a plurality of consecutively numbered storage areas based on the number of the receive scan lines to be simultaneously formed; D. accumulating the scan line data corresponding to the receive scan lines of the same position to form accumulated data; E. storing the accumulated data in the second data storing unit based on the storing start position; and F. shifting the storing start position by one towards a lower numbered storage area to reset the storing start position, and wherein the ultrasound data forming unit is further configured to perform the functions A, B, D, E, F until no storing area to be further shifted in the second data storing unit is detected, and then to perform the functions A, B, D, E and outputting the accumulated data stored in the first storage area of the second data storing unit before function E. an ultrasound data forming unit having a plurality of receive channels wherein the ultrasound data forming unit is configured to perform the functions of: A. storing data provided from the receive channels in a first data storing unit; B. receive-focusing the data based on receive delay curve lookup tables to form scan line data corresponding to each of receive scan line to be simultaneously formed in a single transmission of ultrasound signals; C. setting a storing start position on a second data storing unit having a plurality of consecutively numbered storage areas based on the number of the receive scan lines to be simultaneously formed; D. accumulating the scan line data corresponding to the receive scan lines of the same position to form accumulated data; E. storing the accumulated data in the second data storing unit based on the storing start position; and F. shifting the storing start position by one towards a lower numbered storage area to reset the storing start position, and A. storing data provided from the receive channels in a first data storing unit; B. receive-focusing the data based on receive delay curve lookup tables to form scan line data corresponding to each of receive scan line to be simultaneously formed in a single transmission of ultrasound signals; C. setting a storing start position on a second data storing unit having a plurality of consecutively numbered storage areas based on the number of the receive scan lines to be simultaneously formed; D. accumulating the scan line data corresponding to the receive scan lines of the same position to form accumulated data; E. storing the accumulated data in the second data storing unit based on the storing start position; and F. shifting the storing start position by one towards a lower numbered storage area to reset the storing start position, and wherein the ultrasound data forming unit is further configured to perform the functions A, B, D, E, F until no storing area to be further shifted in the second data storing unit is detected, and then to perform the functions A, B, D, E and outputting the accumulated data stored in the first storage area of the second data storing unit before function E.