A radio controller of a mobile communications system performing broadcasting or multicasting that transmits the same information to multiple cells is disclosed. The radio controller includes a control information comparison part configured to compare the control information of a first one of the cells and the control information of a second one of the cells adjacent to the first one of the cells; and a control information creation part configured to create adjacent cell control information corresponding to the second one of the cells. The control information creation part determines part of the control information of the second one of the cells different from the control information of the first one of the cells as the adjacent cell control information.