An elevator group control system which controls a plurality of elevators as one group, wherein each elevator comprises a car and a control unit, comprising: a call registration device by the use of which a user registers a first hall destination call before getting into one of the cars; a car position detection part for detecting a car position of each elevator; a call registration storage part for storing, for each elevator, the first hall destination call having been registered by the user; wherein the elevator group control system comprises: an assigned car determination part in which, when a second hall destination call having the same contents as those of the already registered first hall destination call stored in the call registration storage part is registered newly from the call registration device, and if a non-assigned car, to which the already registered first hall destination call is not assigned, has already arrived at the floor on which the call registration device is installed, the newly registered second hall destination call is assigned to the non-assigned car, characterized in that the call registration device is provided with an indicator and a ten-key pad, and, when the assigned car determination part assigns the non-assigned car in response to the newly registered second hall destination call, causes, based on information sent from the elevator group control system, display of information about the newly assigned car on the indicator for a predetermined time period. a call registration device by the use of which a user registers a first hall destination call before getting into one of the cars; a car position detection part for detecting a car position of each elevator; a call registration storage part for storing, for each elevator, the first hall destination call having been registered by the user; wherein the elevator group control system comprises: an assigned car determination part in which, when a second hall destination call having the same contents as those of the already registered first hall destination call stored in the call registration storage part is registered newly from the call registration device, and if a non-assigned car, to which the already registered first hall destination call is not assigned, has already arrived at the floor on which the call registration device is installed, the newly registered second hall destination call is assigned to the non-assigned car, characterized in that the call registration device is provided with an indicator and a ten-key pad, and, an assigned car determination part in which, when a second hall destination call having the same contents as those of the already registered first hall destination call stored in the call registration storage part is registered newly from the call registration device, and if a non-assigned car, to which the already registered first hall destination call is not assigned, has already arrived at the floor on which the call registration device is installed, the newly registered second hall destination call is assigned to the non-assigned car, characterized in that the call registration device is provided with an indicator and a ten-key pad, and,