A web service providing apparatus and a web service requesting apparatus that use an inheritable web service by including access modifiers and inheritance relationships for domains, functions, and services in a WSDL for the web service and by referring to the access modifiers and the inheritance relationships, and method of the same. The web service providing apparatus includes: a storage unit that stores an interface document comprising inheritance information and service processing logic; a message generating unit that, with reference to the service processing logic, generates a response message comprising at least one of a result value for a request of a web service and a providing location where the result value is calculated; and a message transmitting/receiving unit that, according to a web service specification, receives a request message comprising the request of the web service and transmits the generated response message as a response to the request message.