A method for initializing and actuating a peripheral by a mainframe with initialization and actuation codes of the periphery stored in a memory comprises the steps of: detecting a peripheral being connected to the mainframe; detecting a type number of the peripheral; the CPU loading initial codes and actuation codes about the type number from the memory of the main frame; sending reset signals to peripheral to reset the peripheral; initializing and actuating the peripherals; sending the initialization and actuating process; and mainframe retaining to be connected to the peripheral. If it is detected that a peripheral is connected to the main frame, while the initialization and actuation codes in the memory of the main frame, the CPU loads the initialization and actuation codes from a memory of a peripheral and then the process enter to the sending step. The device for performing the method is also included.