A method for supporting designing of an electric circuit by a design support equipment, the method comprising: a step of displaying, on a display unit, a first region (L, 18eL) for displaying first design information logically expressing electrical operations of objects to be edited, a second region (P, 18eP) for displaying second design information expressing the objects to be edited in a physical two-dimensional shape, and a third region (G, 18eG) for displaying third design information expressing the objects to be edited in a physical three-dimensional shape; characterized by a step (S1002 - S1008) of, in response to drag-and-drop of a first object of the first design information from the first region (L, 18eL) to the second region (P, 18eP), adding a second object corresponding to the first object, at a certain coordinate value on a substrate displayed in the second region (P, 18eP), within the second design information displayed in the second region (P, 18eP); and a step (S1012 - S1022) of, in response to the addition of the second object within the second region, adding a third object corresponding to the second object, at the same coordinate value at which the second object was added, within the third region so that the first design information, the second design information, and the third design information are kept synchronized and in that the first object is displayed within the first region (L, 18eL) as a symbol of a part, the second object is searched from a shape library and displayed within the second region (P, 18eP) as a two-dimensional shape of the part, and the third object is searched from the shape library and displayed within the third region (G, 18eG) as a three-dimensional shape of the part, the shape library storing the symbol, the two-dimensional shape and the three-dimensional shape of the part. a step of displaying, on a display unit, a first region (L, 18eL) for displaying first design information logically expressing electrical operations of objects to be edited, a second region (P, 18eP) for displaying second design information expressing the objects to be edited in a physical two-dimensional shape, and a third region (G, 18eG) for displaying third design information expressing the objects to be edited in a physical three-dimensional shape; characterized by a step (S1002 - S1008) of, in response to drag-and-drop of a first object of the first design information from the first region (L, 18eL) to the second region (P, 18eP), adding a second object corresponding to the first object, at a certain coordinate value on a substrate displayed in the second region (P, 18eP), within the second design information displayed in the second region (P, 18eP); and a step (S1012 - S1022) of, in response to the addition of the second object within the second region, adding a third object corresponding to the second object, at the same coordinate value at which the second object was added, within the third region so that the first design information, the second design information, and the third design information are kept synchronized and in that the first object is displayed within the first region (L, 18eL) as a symbol of a part, the second object is searched from a shape library and displayed within the second region (P, 18eP) as a two-dimensional shape of the part, and the third object is searched from the shape library and displayed within the third region (G, 18eG) as a three-dimensional shape of the part, the shape library storing the symbol, the two-dimensional shape and the three-dimensional shape of the part.