1. A method of displaying stereoscopic information related to an ultrasound sectional plane of a target object, the method comprising: setting a line of interest on the ultrasound sectional plane of the target object based on a received input; obtaining an ultrasound signal of the ultrasound sectional plane of the target object along the set line of interest; converting the obtained ultrasound signal to represent the stereoscopic information in a three-dimensional manner; and displaying the stereoscopic information related to the ultrasound sectional plane of the target object in a stereoscopic space, wherein the displaying the stereoscopic information comprises displaying information in which brightness values of the ultrasound sectional plane of the target object along the set line are represented by height values on a first axis of the stereoscopic space.