To provide a radio base station and a control method thereof wherein a simple way is used to relax the load concentration of a power control and also relax the control delay. A radio base station and a control method thereof wherein a frame generating part inserts a dummy TPC command, and a power setting part sets a TPC command, whereby a process of deciding the TPC command to be inserted can be delayed by the time required for the processes done in the frame generating part, a modulating part and a spreading part and wherein the process of deciding the TPC command and a process of deciding a power value are separated from and done at different timings from a process of controlling a TPC command insertion status and a process of controlling a power setting status, with the result that even when the processes are concentrated, a load dispersion can be done.