A method of displaying an ultrasound image includes determining a direction of a fetus's head based on a first ultrasound image obtained by scanning a pregnant woman's body in a first direction; determining a direction of a fetus's spine based on a second ultrasound image obtained by scanning the pregnant woman's body in a second direction; determining an orientation of the fetus within the pregnant woman's body based on the directions of the fetus's head and the fetus's spine; and displaying an image representing the orientation of the fetus, together with an ultrasound image obtained by scanning the pregnant woman's body.