1. A modeling system comprising: a standard model obtaining unit for obtaining a standard model as a standard three-dimensional model of an object; a data obtaining unit for obtaining a plurality of pieces of measurement data by measurement of a plurality of times performed on the object; and a model generating unit for generating a three-dimensional model of the object by deforming the standard model so as to optimize a predetermined evaluation function including an evaluation element on the plurality of pieces of measurement data, wherein the model generating unit generates the three-dimensional model by using some pieces of measurement data out of the plurality of pieces of measurement data, the sum of reliability of said some pieces of measurement data satisfying a predetermined criterion.