A method for simulating a physical-keyboard signal includes executing a monitoring program in an operating system, receiving at least one input key code signal by the monitoring program, sending the input key code signal to an embedded controller, looking up a key mapping table by the embedded controller according to the input key code signal to obtain a keyboard scan code signal corresponding to the input key code signal, sending the obtained keyboard scan code signal to the operating system, and performing a corresponding function by the operating system according to the keyboard scan code signal.