1. A method of displaying a medical image, the method comprising: obtaining a characteristic value for each of one or more segments included in an object; generating an image of the object indicating the segment of which the characteristic value is a predetermined value and including information that indicates a time when the characteristic value reaches the predetermined value; and displaying the image, wherein the segment and the time are displayed together on the image, wherein the information indicating the time includes a difference between a reference time and an actual time when the characteristic value reaches the predetermined value, wherein, when two or more segments exist in the step of obtaining a characteristic value, the reference time is a time when an average of the characteristic values of the segments reaches the predetermined value, and wherein the information indicating the time includes a time difference indicating how sooner or later the characteristic value reaches the predetermined value with respect to the reference time.