The present invention aims to provide a display device that can display relationships between a plurality of users in an easy-to-visually-acknowledge manner.The present invention is a system composed of a data sensing unit 1, a positional relationship detection unit 2, a user groping unit 3, and a positional relationship display unit 4. The user grouping unit 3 groups the users into a plurality of groups based on information pieces relating to positional relationships between the users, which are detected by the positional relationship detection unit 2. Based on information pieces relating to the groups extracted by the user grouping unit 3, the positional relationship display unit 4 arranges and displays the groups on a screen in conformity with a positional relationship between the groups.