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Usage of current computers is limited in collaborative work in face-to-face meeting because architecture of the most computers is designed considering their personal use. This paper discusses collaborative work of organizing information represented on cards as one of the commonly seen activities in both business and school education. The authors developed a prototype system to computerize such task so as to enhance reuse of products of the collaborative work. The developed system is implemented as an application of Single Display Groupware (SDG) to allow manipulation by multiple users sharing information on a display.