1. A marking apparatus for marking a location in a medical image, comprising: a providing unit for providing a first marker within a first medical image, which shows an object, at a first location, a location determination unit for determining a second location, which corresponds to the first location, within a second medical image showing the same object, a marking unit for marking the second location with a second marker, which is different from the first marker, and a presenting unit for presenting the first medical image, the first marker, the second medical image and the second marker.