Miniaturization of smart devices and sensors, as well as widespread use of new interaction modalities make Ambient Intelligence (AmI) not a pro-spect for the future but an impending reality of existence. This requires methods for solving the issues on how to integrate interaction devices into a context-aware environment. We thus designed a middleware to provide a promising ap-proach. Our middleware adopts a two-layer structure. The lower layer is the en-terprise service bus, which is in charge of integrating context sensors and inter-action devices, and of discovering context. The higher layer is the versatile con-text interpreter, which is responsible for context inference, expressive query, and persistent storage. Finally, we implemented the prototype of this middle-ware on the street and store marketing scenario.