A method operates a group service or several group services in a communications network. The method involves detecting specific group service and/or specific group event-related data items in an event-recording unit, transmitting at least a part of specific group service and/or specific group event-related data items from the event-recording unit to a group lists-generating unit, evaluating said specific group service and/or specific group event-related data items and generating specific group lists by said group lists-generating unit, wherein said specific group lists indicate the current participation state of the group participants to the group service or to each group service.