An input method and apparatus of a device. The method includes: tracking and recording movement of an eyeball gaze point of a user on a display screen of the device, to obtain a current eyeball gaze point movement trajectory; judging whether the current eyeball gaze point movement trajectory matches with a preset eyeball gaze point movement trajectory in a movement trajectory database; wherein the preset eyeball gaze point movement trajectories indicate paths of the movement of the eyeball gaze point on the display screen according to a preset length range within a preset time period; if matched, determining a corresponding input instruction by using the matched eyeball gaze point movement trajectory, and completing an input operation according to the input instruction; and if not matched, not conducting an input operation. The input method and apparatus of a device can conduct input according to the eyeball movement of the user.