A plurality of data communication terminals having a data display function is individually provided in each of a plurality of locations of use where general users individually check in. A user storage unit stores the user ID data and the location ID data with respect to each general user who has checked in, and a situation storage unit stores user situation data of the general user who has checked in, together with the user ID data. A group identification unit identifies the plurality of general users who have checked in as a group, and a listing display unit causes each of the data communication terminals in the plurality of locations of use where the general users of the group have checked in, to display a listing of at least the user ID data, the location ID data, and the user situation data of another member of the group. Thus, a data processing system is provided that allows the general users of the group, who have individually checked in for the plurality of locations of use, to confirm the situation of another member at a glance.