A method for compilation optimization using activation recalculation is provided, which is performed by one or more processors, and includes receiving a source program, determining an operation to be executed in a processor based on the source program, and determining whether or not the operation to be executed corresponds to the operation for activation recalculation, thereby automatically classifying the operation to be executed into a first operation type corresponding to the operation for activation recalculation or a second operation type not corresponding to the operation for activation recalculation.