1. An information processing device including registers each holding data, and an operation device to perform an arithmetic and logic operation on input/output data held in said registers, for sequential processing in accordance with instructions, and configuring so as to issue an inter-register copy instruction for copying data being held in one register to another register, comprising: a copy information holding device to reserve for performing a data copy operation by said inter-register copy instruction, wherein a reservation for performing a data copy operation is stored in said copy information holding device in an execution phase of said inter-register copy instruction and an execution phase is completed without an actual data copy operation.