Disclosed is a technique whereby a superior information search function, for example, is acquired, and a correlation between a drawing, such as a board diagram or a circuit diagram, and parts included in the drawing can be precisely expressed, and whereby the labor required to produce an electronic service manual can be reduced. According to this technique, an index page is displayed in an index page display area (a left frame) on a display device, while a parts table page is displayed in a parts table page display area (a lower portion in a right frame). Then, when a drawing category displayed in the index page display area is selected, a board diagram or a circuit diagram corresponding to the selected drawing category is displayed in a drawing display area (an upper portion in the right frame). Further, when a graphics primitive is selected in the board diagram or the circuit diagram displayed in the drawing display area, a part entry corresponding to the selected graphics primitive is displayed in the parts table page display area. And when a part entry displayed in the parts table display area is selected, a board diagram or a circuit diagram including the selected part entry is displayed in the drawing display area.
