A computer-readable recording medium in which basic-administrative-tasks software programs are recorded, according to this invention provides a module for data-writing processing into a database in a manner so as to maintain compatibility of data between tables, even when customized data is included in a table. The module for writing data is equipped with both a data-writing processing functions group corresponding to the customization, and a writing means for simultaneously updating both a customizing region and a core region in the database memory on a disk.