Nowadays, the demands for composite services with devices such as sensors/actuators and Web services have increased . Many kinds of cloud services that can connect to real world, as typified by image recognition or speech recognition has come into widespread use to address the limitation in information processing on devices. In that situation, sensors are also provided as sensor services that senses the environment and provide its stream data by enterprises. In contrast to Web services, available sensor services and users' context vary with environmental changes (Fig. 1). Especially, when users move moment by moment, for instance in vehicles, the change is expected to become more dynamic.