1. A method for molding a three-dimensional object, comprising: building up layers formed of bonded powder to form a three-dimensional object; forming a support below the three-dimensional object; providing unsolidified powder between the three-dimensional object and the support; removing a part above the support as a removed molding object including the three-dimensional object supported by the support via the unsolidified powder; and drying the removed molding object including the three-dimensional object supported by the support via the unsolidified powder by a drying furnace.