In spite of the relatively large size of the astronomical community in Japan, there have been rather few efforts to organize an astronomical data system(s) and to take advantage of such systems. As a matter of fact, it has been realized that astronomical data, as the volume grows, are in many cases easier to handle in computer readable form than in printed form, and there is a growing trend of recording observational data or large tables on magnetic tapes and the likes, and of acquiring such data from other investigators (notably from investigators in other lands). However, it has not always been realized that machine-readable data bring about various kinds of problems when they are to be used by a number of astronomers whose fields of interest are different from each other or who works at geometrically scattered insitutions.