DATA PROCESSOR, DATA PROCESSING SYSTEM AND METHOD AND RECORDING MEDIUM

PROBLEM TO BE SOLVED: To provide a data processor efficiently realizing trial-and-error calculation fulfilling the desire of each client, or simulated calculation during data update in a simple constitution. SOLUTION: A first managing means 112 manages the group of object data (contexts #0, #1, #2,...) being the object of arbitrary processing to be executed by clients C1, C2, C3,... for each client. Second and third managing means 111 manage relations between the object data constituting the contexts and entity corresponding to the object data for each context, and manage the parent/ slave relation (context tree) of the contexts.