According to an embodiment, an information processing device offering various APIs stores, for every application program, a WSDL file which indicates definition information of an API which is permitted to be used by an application program, and developer information which specifies a developer of an application program. The information processing device releases to an application program a WSDL file corresponding to the application program, receives, through a web service, a request that is a request for use of a first API, determines whether or not the definition information of the first API is indicated in a first WSDL file corresponding to the first application program, and determines whether or not the first WSDL file is leaked, using developer information.