1. A medical image registration method comprising: determining whether a reference point of registration is present in a first medical image and a second medical image of an object; in response to determining that the reference point is not present in at least one of the first medical image and the second medical image, estimating a virtual reference point corresponding to the reference point in the at least one of the first medical image and the second medical image, in which the reference point is not present, by using anatomical information of the object; and registering the first medical image and the second medical image by using the estimated virtual reference point.