Research on providing services or sharing resources in a cloud computing environment is increasing. The problems of this environment are discovery of service and data collision for either sharing data or services. This paper suggests an ontology-based service integration system model efficient in service discovery and free from data collision between services. Thus, we define a logical hierarchical model of service integration. The ontology consists of service ontology and data ontology, which are the basis of efficient service management and resolving data collision to provide semantic association of data and service. This can be efficient in service integration of SaaS in a cloud computing environment.

cloud computing, ontology, query conversion, service ontology, OWL-s, SaaS (software as a service).