One of the main issues in Service Identification is comprehensive understanding of service concept. Service in SOA contains a lot of elements and concepts. This paper has tried to provide a semantic context of service in service identification phase by using existing knowledge in different service identification methods and definitions about services in SOA. Then using enterprise ontology, as a tool for modeling enterprise, we display concepts and aspects of service that can be mapped to concepts of enterprise ontology. Here we use IDEAS ontology as an enterprise ontology case.