A mobile communication controlling apparatus for controlling inter-frequency handover includes a required quality identifying unit configured to identify a quality required for data addressed to a mobile station, a transmission rate control unit configured to control a data transmission rate of a higher layer based on the identification result supplied from the required quality identifying unit, and an inter-frequency handover instruction unit configured to temporarily suspend signal transmission from a radio base station connected to the mobile communication controlling apparatus and allow the mobile station to perform inter-frequency measurement.