The invention discloses a touch display apparatus and method for realizing a three-dimensional touch function. The touch display apparatus comprises a display screen used for displaying images, at least one ultrasonic detection apparatus used for monitoring three-dimensional position information of a touch medium in real time, and a processor connected with the display screen and the ultrasonic detection apparatuses and used for obtaining the three-dimensional position information, determining a motion track of the touch medium and a relative position relationship between the touch medium and the display screen according to the three-dimensional position information, and outputting a control instruction to the display screen according to the motion track and the relative position relationship, thereby performing corresponding operation on the displayed images. The three-dimensional position information of the touch medium is monitored through the ultrasonic detection apparatuses; the motion track of the touch medium and the relative position relationship between the touch medium and the display screen are determined according to the three-dimensional position information through the processor; and the control instruction is generated according to the parameters to control the displayed images to be subjected to the corresponding operation, so that the user experience is improved.