CLIENT SERVER SYSTEM AND CONTROL METHOD THEREOF

A client server system to which a plurality of client machine devices are coupled. Each client machine device executes a database data generation task and database data processing task which are a plurality of functional tasks each corresponding to a different function. A master task and common memory for controlling each database data generation task and database data processing task is disposed in each client machine device to allow a function originally handled by a client machine device in a work load concentration state or abnormal state to be handled by another client machine device.