The display system has a function of a digitizer which senses the location of a touched pin and produces detailed vocal information of a part of the drawing which is indicated by the user's finger. The proposed system requires less labor from the user in understanding a drawing, since this method passes information more efficiently than other methods. The system was tested with electric circuit-diagrams. The results show that there is no best tactile display method for all blind people, i.e., the best method depends on each user, and this kind of vocal information should be as simple as possible.