A radio control apparatus has a transmission speed control section and a memory section. The transmission speed control section calculates the transmission power of a data signal to be transmitted to a cell phone based on the transmission power of a control signal to be transmitted to the cell phone and an offset value to be applied to the transmission power of the control signal. The transmission speed control section compares the transmission power of the data signal with an upper limit value stored in the memory section, and performs control to decrease the transmission speed of the data signal when the transmission power of the data signal is greater than the upper limit value and to increase the transmission speed of the data signal when the transmission power of the data signal is less than or equal to the upper limit value.