Disclosed herewith is a system for keeping sensing of mass data of members of an organization with respect to states of their meeting and activities and analyzing and evaluating their interactions according to those sensor data. Interaction data includes first information denoting whether or not a terminal unit has faced a different terminal unit and second information denoting a state of the terminal unit and excluding information denoting positions of the first information and the terminal unit. An interaction data display apparatus includes a receiving unit for receiving interaction data from the terminal unit and a display unit for displaying the received interaction data. The display unit displays the first and second information items included in the interaction data received by the receiving unit so as to be related to each other according to times at which those first and second information items are obtained respectively.