A three-dimensional object data generation apparatus includes an obtaining unit that obtains three-dimensional object data regarding a three-dimensional object represented by plural first voxels for which a first attribute is set and a replacement unit that, if the first attribute is different from a second attribute achievable by a three-dimensional object forming apparatus that forms the three-dimensional object, replaces each of the plural first voxels with plural second voxels for which the second attribute is set such that the plural second voxels become equivalent to the first voxel.