INPUT METHOD AND INTELLIGENT TERMINAL DEVICE

This application discloses an input method and a smart terminal device, to improve an effect of an ultrasonic wave based input action identification function of a smart terminal device. In the solution, after a processor in the smart terminal device determines, based on a first detection solution of a first infrared sensor, that a target object enters or leaves a first space range from a first plane, the processor starts or stops displaying a cursor based on distances measured by ultrasonic sensors; and after the processor determines, based on a second detection result of a second infrared sensor, that the target object enters or leaves a second space range from a second plane, the processor starts or stops performing a confirmation operation based on a location of the cursor. In the solution, a user can adjust a location of the target object to implement an expected operation on the smart terminal device. Apparently, according to the solution, an effect of an ultrasonic wave based input action identification function of a smart terminal device can be improved, and user experience can be improved.