The invention provides an input method and an input system for an electronic device, the electronic device with input function and content display function, and a method and a system for displaying content of the electronic device. The electronic device is provided with an induction screen. The input method of the electronic method comprises the following steps: firstly, displaying a plurality ofvirtual keys; secondly, receiving an input signal; thirdly, displaying the corresponding amplified virtual keys on the induction screen; next, judging whether an input identification signal is inputted or not; and finally, outputting a virtual key code corresponding to the input identification signal if detecting the input identification signal.