1. A database system comprising: an original database; a public database for storing data including readout data read from said original database and processed data processed from the readout data; data management means for managing the data stored in said public database and attribute data of the data stored in said public database, in a corresponding manner, the attribute data including management point data corresponding firstly to items of the processed data stored in said public database and secondly to references of management and evaluation for data exploitations; and inquiry means for processing and displaying output data based on the data stored in said public database and the attribute data in accordance with a demand of a user.