The present invention is directed to a service-extensible, completely new "safe service extension platform" in which false access, by an execute form which implements a digital content providing service, can be eliminated without the need to deny a process which might cause the false access. The safe service extension platform, in which services are associated with an execute form and the services are extended by changing or adding the execute form, includes a service-dependent API for extending the services. The service extension from the execute form is carried out only by calling the service-dependent API.