PROBLEM TO BE SOLVED: To provide an RDB (relational database) system of variable structure.SOLUTION: The RDB system comprises an RDB 1 and a processing unit 3 for executing processing for the RDB. The RDB includes a class table which manages a class defining a structural unit for data storage, a property table which manages property being attribution associated with each class, an instance table which manages instance being an entity attributed to each class, and an entity value table which manages an entity value indicating a value that the instance has each property. The processing unit has class management means 32 for managing a class record, property management means 33 for managing a property record, instance management means 34 for managing an instance record and entity value management means 35 for managing an entity value record.SELECTED DRAWING: Figure 1
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