The present invention is applicable to the field of digital television and provided thereby is an interactive digital television system, comprising a set-top box and a display connected to the set-top box; the set-top box comprises a processor, an operating circuit, a three-dimensional (3D) projector and a holographic projection screen; the processor is connected to the 3D projector and the operating circuit respectively, the 3D projector being used to project a key identification configured on the set-top box onto the holographic projection screen for display; the 3D projector comprises a first sensor module, used to inductively obtain movement information in the projection area; an information coding module is used to carry out coding processing on the movement information inductively obtained by the first sensor module, thereby forming an operation signal; a signal transmission module is used to send the operation signal to the processor; and the processor is used to drive the operation circuit to carry out a corresponding operation according to the operation signal. With the present invention, interaction is carried out with a digital television by means of projecting the key identification on the set-top box in 3D and inductively obtaining the operation signal of a user in the projection area, thus being highly intelligentized and extremely convenient for the user.
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