An apparatus for measuring a shape of a surface, comprises a measurement head which measures at least one of a distance between a reference point and the surface and a direction of a normal from the surface to the reference point, a scanning mechanism which scans the measurement head, and a processor which calculates the shape of the surface based on a measurement result measured using the measurement head and coordinates of the reference point, wherein the coordinates of the reference point are calibrated using a measurement result measured by scanning the measurement head along a scanning path in association with a first surface to be measured, and a shape of a second surface to be measured is calculated based on a measurement result measured by scanning the measurement head along the same scanning path in association with the second surface, and the calibrated coordinates of the reference point.