There is provided a technique with which a function that an OSGi bundle is equipped with may be published via a web API with ease. A web API server program according to the present invention receives as an HTTP request a class name and method name of an OSGi bundle (OSGi service) registered with an OSGi framework, calls and executes an OSGi bundle (OSGi service) that matches them, and returns a result thereof as an HTTP response (see FIG. 2).