To reduce establishment processing of service XML and to improve the degree of freedom in process logic description by reducing a used quantity of a memory for a business integrated server.

The business consolidation server establishes a service request input 14 from a client as a default service XML 13A, generates a mapping XML 15 when there is an instruction from a process logic 11, deletes the service XML 13, attaches the XMLs, and requests task execution of a business supporting server 12. A task execution result is established as a task result XML 13B, the mapping XML is deleted with an instruction from the process logic, and the task result XML is established as the service XML. With all the tasks completed, held default service XML and task result XML are established as a final service XML, a style sheet 18 is used to convert the final service XML, and it is outputted to the client.

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