1. An information processing apparatus comprising: an area calculator configured to calculate, in each of a first plane and a second plane, an area of a triangle whose apexes are three feature points of four feature points; a first matrix calculator configured to calculate, in each of the first plane and the second plane, a first transformation matrix and a second transformation matrix for transforming four reference feature points into the four feature points, by using the area of the triangle whose apexes are three feature points of the four feature points; and a second matrix calculator configured to calculate a third transformation matrix for transforming the four feature points of the first plane into the four feature points of the second plane, by using the first transformation matrix and the second transformation matrix.