The explosive increase in demand for mobile communication services has created a sudden increase in the number of subscribers to these services, and in mobile communication network traffic. Mobile communication networks contain extremely large numbers of network elements (NEs). Replacing the NE software requires extremely large numbers of provisioning workers with the advance knowledge and experience. This paper describes the basic concept of the organization hierarchy agent model, devised for application to the operation support systems (OSSs) that are being used to support provisioning works. By applying this agent model to OSSs, OSS software can be rapidly and flexibly changed to meet changes and additions to provisioning works procedures. This paper also describes the characteristics of the completed systems that apply this agent model, and presents performance evaluation results for the systems.