Abstract: A method of designing a cubic receptacle which determines the form of the receptacle in consideration of an internal capacity of the receptacle or an amount of material required for manufacturing the receptacle to prepare a two-dimensional pictorial image of the receptacle of which form is thus determined with a label being attached thereon to appraise the pictorial image thus obtained. To carry out the above design, a computer and various input/output units are used.In addition, a designing method particularly suitable for determining the form of a receptacle of body of revolution. Such a determination of the form is made using a coordinate input unit.Moreover, a technique is provided for representing a three-dimensional body in a two-dimensional manner, especially to a techique for representing a cubic receptacle on which a label is attached in a two-dimensional manner. In addition, a special algorithm is used for representing an impression of material quality of the receptacle.