Information processing device, program, information processing method and molding system

Provided is an information processing device which provides molding data to a lamination molding device that molds a molded object by repeatedly laminating a material. The information processing device includes: a volume calculation means for using data relating to the shape of the object to be molded so as to calculate the volume of the object to be molded; and a support part molding method determination means for determining a molding method for a support part which supports the object to be molded in accordance with the volume thereof.