A buffer control device included in a base station apparatus acquires predetermined information regarding data communication between the base station apparatus and external apparatuses other than the base station apparatus. The buffer control device predicts an amount of traffic in the data communication based on the acquired predetermined information, and controls an occupation ratio of each of regions that are arranged in a buffer in association with a plurality of priorities, based on the amount of traffic in the predicted data communication, where the buffer stores pieces of data each of which is assigned one of the plurality of priorities and transmitted within the base station apparatus from a first processing unit to a second processing unit via a high speed serial interface.