A radio base station includes: a communication quality detector (183) configured to detect communication quality in a subcarrier; a positional information acquisition unit (182) configured to acquire positional information indicating a position of a radio communication terminal at a time point when the communication quality is detected by the communication quality detector; subcarrier information table storage (185) configured to store a subcarrier information table including a subcarrier number, the communication quality, and the positional information, in association with one another; current positional information acquisition unit (180) configured to acquire current positional information indicating a current position of the radio communication terminal; and allocator (189) configured to allocate the communication channel to the radio communication terminal on the basis of the subcarrier information table and of the current positional information.