Abstract: A purchasing company registers selling companies with which she does not want to trade in a setting management unit, and a selling company registers purchasing companies with which she does not want to trade in the setting management unit. The registration information is stored in a selling company/purchasing company table. An electronic catalog is made public only to purchasing companies with which the selling company permits trade. A transaction unit makes an estimate request received from a purchasing company public only to selling companies with which the purchasing company permits trade.

Abstract: A relational database synchronization method for synchronizing master data with data of replica machines, which data is updated usually with the replica machines disconnected from a master machine, so that there may be no inconsistency among the data. After a replica machine is connected to the master machine via a network at an arbitrary time, it extracts records of which the day of last update is later than a master differential extraction completion time, from replica data as replica differentials, and the master machine extracts records of which the replica differential reflection time is later than the master differential extraction completion time, from the master data as master differentials, updates the master differential extraction completion time to the current time, and causes the replica differentials to be reflected in the master data. The replica machine then causes the master differentials to be reflected in the replica data and updates the master differential extraction completion time.

Abstract: A purchasing company registers selling companies with which she does not want to trade in a setting management unit, and a selling company registers purchasing companies with which she does not want to trade in the setting management unit. The registration information is stored in a selling company/purchasing company table. An electronic catalog is made public only to purchasing companies with which the selling company permits trade. A transaction unit makes an estimate request received from a purchasing company public only to selling companies with which the purchasing company permits trade.

Abstract: A computer graphics data display device and method simplify a movement interference calculation by use of an interference attribute of an object, and control a process time by predicting a display time of a frame. Furthermore, the number of simultaneously calculated moving objects is restricted to speed up the calculation, and a retrieving process can also be performed at a high speed using display data obtained by compressing editing data. If any change has arisen in the editing data, only change data are transmitted to a display data memory unit, and the editing data and the display data are concurrently processed. Thus, dynamic images can be successfully displayed with reality.