With progress of Computer and network technology, it is thought that a new computer network will be built for exchanging information. Users Can retrieve optimal and up-to-date information on any time in this network. In order to provide such a computer network, the network needs to have capability to collect various kinds of information from many places. Therefore an equipment to collect information, e.g. sensor, is one of the most important pants in this network. However, the collected information by sensors may include some kinds of personal privacy, and access to the privacy data should be restricted. In this paper, we propose a mechanism that controls the privacy data in the new computer network that has capability to collect information by sensors (Sensor Information Network).
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