Disclosed is a wireless base station (eNB10-1) which calculates resource block usage based on the number of resource blocks in the downstream direction (downstream resource block usage) and the number of resource blocks in the upstream direction (upstream resource block usage) allocated to a wireless terminal (UE30-1), and sets the number of DSP for which a power supply should be turned on in a manner such that the number of DSP for which a power supply should be turned on is reduced as resource block usage decreases. In addition, the wireless base station (eNB10-1) turns on the power supply for the set number of DSP and turns off the power supply for the remaining DSP.