A three-dimensional ultrasound system comprising: a scanning unit configured to scan an object and generate ultrasound data; a measuring unit configured to receive an input of a measurement point in the ultrasound data and generate measurement data associated with the measurement point; and a display controller configured to compare the measurement data with reference data, determine one of an abnormal grade, a warning grade, and a normal grade, and display the measurement data based on the determined grade, wherein if the object is a fetus and the measurement point is an input around to a Nuchal Translucency of the fetus, the measuring unit is configured to generate two measurement lines corresponding to the NT of the fetus, measure the distance between the two measurement lines as the measured length of the NT and generate measurement data including the measured length, wherein the reference data include a measurement statistical distribution for each of ages based on number of fetuses and NT lengths, wherein the display controller is configured to analyze an age of the fetus based on the ultrasound data, extract from a plurality of standard length ranges in the reference data a first standard length range corresponding to the age that is obtained from the analysis, compare the first standard length range with the measured length in the measurement data and determine the grade, wherein if the determined grade is the 'warning grade', the display controller is configured to display the measurement data by adjusting a luminance of a color allocated to the warning grade based on a distance between the measurement point and one of abnormal and normal intervals within a measurement statistical distribution data for the measurement point. a scanning unit configured to scan an object and generate ultrasound data; a measuring unit configured to receive an input of a measurement point in the ultrasound data and generate measurement data associated with the measurement point; and a display controller configured to compare the measurement data with reference data, determine one of an abnormal grade, a warning grade, and a normal grade, and display the measurement data based on the determined grade, wherein if the object is a fetus and the measurement point is an input around to a Nuchal Translucency of the fetus, the measuring unit is configured to generate two measurement lines corresponding to the NT of the fetus, measure the distance between the two measurement lines as the measured length of the NT and generate measurement data including the measured length, wherein the reference data include a measurement statistical distribution for each of ages based on number of fetuses and NT lengths, wherein the display controller is configured to analyze an age of the fetus based on the ultrasound data, extract from a plurality of standard length ranges in the reference data a first standard length range corresponding to the age that is obtained from the analysis, compare the first standard length range with the measured length in the measurement data and determine the grade, wherein if the determined grade is the 'warning grade', the display controller is configured to display the measurement data by adjusting a luminance of a color allocated to the warning grade based on a distance between the measurement point and one of abnormal and normal intervals within a measurement statistical distribution data for the measurement point.