抄録
In order to construct the security environment that watches suspicious objects and the ubiquitous environment that prevents object's mislayings, we developed a searching system "Where is that?" This system recognizes movements of objects at events when the objects are placed or moved by persons, then it saves the history of the movements. Motions of persons and motions of the objects made by persons are distinguished certainly, and only motions of objects moved by persons are recognized. This means that unnecessary histories produced by persons' motions are sharply reduced. This system consists of broad area cameras and local area cameras connected on a network. Therefore they are useful for security.
