PURPOSE: A structure designing method using a CAD program which automatically changes a 2D CAD drawing into a 3D CAD drawing is provided to modify each of elements changed as a 3D CAD image in two dimensions on a 3D CAD workspace. CONSTITUTION: Equipment, a connection member, a branch, or a locking member created on a 2D CAD drawing are displayed as a 3D CAD drawing is about a three dimensional image. Each coordinate location or each size of the equipment, the connection member, the branch, or the locking member is modified and changed. Modification facts are reflected in the 2D CAD drawing. [Reference numerals] (AA) Step for writing a 2D CAD drawing; (BB) Step for converting into a 3D CAD drawing; (CC) Step for modifying and changing the 3D CAD drawing; (DD) Step for displaying a modification and a change in the 2D CAD drawing; (EE) Inputting an attribute and a coordinate location of equipment; (FF) Displaying a connection point of the equipment; (GG) Displaying a connection member, a branch, a locking member; (HH) Displaying the equipment(having the coordinate location); (II) Displaying the connection member between the equipment according to a virtual hexahedron edge route; (JJ) Displaying a location of the locking member, etc; (KK) Automatic moving process of the connection member in case of changing the an equipment location; (LL) Moving process of a composing element located on the connection member; (MM) Route modifying processor through a panel point change; (NN) Connection member moving route modifying processor using a virtual quadrangle function; (OO) Route change processor using a virtual panel point
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