1. An information input apparatus comprising: a semi-transparent screen that functions as an operator input manipulation surface; pickup means for picking up an input manipulation of an operator on the semi-transparent screen by capturing only light or electromagnetic waves in a predetermined wavelength range that comes through the semi-transparent screen, to thereby produce a pickup signal; and control processing means for generating detection image information corresponding to the input manipulation of the operator based on the pickup information, and for executing a control process based on input manipulation information that is recognized based on the detection image information.