A base station 100 includes: a specifying unit 125 configured to specify a decrease target TTI that indicates the TTI in which a sum of already assigned transmission rates is larger than an allowable receiving transmission rate; a selecting unit 126 configured to select, as a decrease target radio terminal, the radio terminal to which the TTI in the decrease UTI is assigned; and a scheduling unit 120a configured to transmit, to the decrease target radio terminal, transmission rate decrease data that is the transmission rate control data (AG or RG) for instructing a decrease of the transmission rate.