The problem to be solved is to alleviate the distortion characteristic of an amplifier and to prevent the drop in gain with respect to a low-level high-frequency signal. The branch reservation station unit generates an entry storing a branch or data required to process the branch if an instruction is decoded, and it is determined that the instruction is a branch instruction or a process is required for a branch. An elevator allocated to a hall call is evaluated on orthogonal coordinates in which the real call evaluation index and the future call evaluation index are defined as an X and a Y coordinate axis.