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Mobile and ubiquitous computing is now put into practical use, with the spread of wireless communication environment and digital devices that are suitable for mobility. People often come together with these devices, and make a team to share information in order to work cooperatively. In this paper we propose DACS (Distance Aware Computing System) that supports collaborative situation as face-to-face meetings. We will introduce the concept of physical distance between users to simplify the operations. Services are easily presented by DACS without any additional operations and users only needs to approach a certain working place with their terminals, and are able to gain information from neighboring devices, or are able to cooperatively use devices settled in meeting rooms. Several applications to support face-to-face collaborations are implemented, and from the experiments total significance of DACS is shown.