A radio base station (1) determines allocated radio resources and a Modulation and Coding Scheme (MCS) for each of a plurality of bandwidth-guaranteed radio terminals in a manner such that an amount of radio resources to be allocated to each bandwidth-guaranteed radio terminal is increased and the MCS to be set for each bandwidth-guaranteed radio terminal is reduced as far as possible within a range that allows a transmission rate of each bandwidth-guaranteed radio terminal obtained after the radio resources are allocated to the plurality of bandwidth-guaranteed radio terminals to achieve a desired transmission rate. Accordingly, for example, it is possible to provide adaptive modulation and coding that allows a bandwidth-guaranteed user to achieve a desired transmission rate (or that makes it possible to increase a probability of achieving a desired transmission rate).