Many railway companies in Japan have adopted a computerized facility management system for better efficiency and other benefits. There are some serious problems, however, such as high costs of initial data registration and inconsistency between ledgers and drawings. In order to solve these problems, we have proposed a facility management system called Dynamic Generation System (DGS). Further, we developed a method to construct a database as a facility ledger, by arranging facilities on the drawing interactively and setting attribute data. We show an example of the method of data writing on drawings applied to electric power facilities.