Abstract: An object oriented system is configured to have the steps of creating an object oriented part composed of a data section and a procedure section for defining specification information about I/O and procedure information indicating the processed content at each data item of a business processing program for performing a process about a data item, storing the object oriented part in a library, selecting the object oriented part suited to a request from the business processing program from the library, creating an item object served as an execution module for the data item to be processed by the business processing program, and performing a data item process depending on the business processing program according to each item object.

Abstract: Data item parts and database manipulation parts are prepared in advance, and a business transaction program is generated by combining the data item parts and the database manipulation parts in accordance with a business transaction specification. The data item part includes a data unit and a procedure unit, which is provided for each data item to be processed by the business transaction program, the data unit storing data to be processed, and the procedure unit storing procedure information defining the process contents of the data to be processed.