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The Web of Things concept has been proposed to integrate heterogeneous devices and provide a light-weight and easy-to-use way for application development by leveraging RESTful web services. However, Web of Things still does not address the issue of composition of physical resources, especially of how business process could be managed among different organizations to automate process of activities. On the other hand, cloud computing framework is based on web services technologies which focus on reusing and composing legacy resources to facilitate developing and managing IT systems. In this paper we have proposed the concept of Gateway as a Service which is a cloud computing framework for Web of Things. Within the proposed concept we introduce the technical architecture of three-layered stack based on study of an aging care use case. Implementations based on the aging care use case are also discussed and results are analyzed to illustrate the feasibility and reasonability of the proposed concept.