1. A method of displaying additional information related to a measured value of an object, the method comprising: acquiring measurement item information of the object; acquiring at least one of a measurement point and a measurement direction for the object; determining a reference value for a measurement based on the acquired measurement item information; acquiring the measured value of the object based on the at least one of the measurement point and the measurement direction; and displaying additional information including the determined reference value and the acquired measured value, wherein the measurement item information of the object comprises profile information of the object and information about a measurement item determined according to a portion of the object to be measured.