A Radio Equipment Controller connected, via a plurality of transmission paths, to a plurality of pieces of Radio Equipment for performing communication with a mobile station, and also connected to an upper-level device is provided. The Radio Equipment Controller includes a required time measurement portion that measures, for each piece of Radio Equipment, required time for the Radio Equipment and the Radio Equipment Controller to relay data that has a predetermined size and is transmitted and received between the upper-level device and the mobile station, and a relaying portion that relays target data that is data to be transmitted and received between the upper-level device and the mobile station by delaying a time to transmit the target data based on the required time for the Radio Equipment relaying the target data.