This paper describes conceptionof social robot systemas self-organizing system. Distributed autonomousrobot systemis not autonomousas a group, if the systemtotally depends on the external intervention to maintain its fundamentalfunction. Wediscuss the meaningof autonomy for group robot system and a concept of collective autonomyas a fundamental frameworkfor design of the social robotic system.It is firstly discussedthe difference betweencooperative and self-organizing behavior. After brief reviewof the classical self-organizing systemtheory, wepresent the self-referential couplingof serf-organizing systemsas a design frameworkof the collective autonomous system. Throughprimitive simulation model, we also discuss relation betweenredundancyand optimality in the systemstructure.