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This paper proposes a new concept of a shared and combined screen for new small devices called GDA (Group Digital Assistant). In the GDA, the screens of two PDAs can he shared at a sharing view mode, and can he treated just like one screen at a combination mode. The GDA uses a wireless LAN and Bluetooth for radio communication. We have developed application software and experimented in cooperative work for evaluation. We found that functions of the GDA were effective in actual cooperative work. The concept of the GDA can make flexible usage of a cellular phone and a PDA in the next generation.