Disclosed are a video processing apparatus, a content providing server, and control methods thereof. The video processing apparatus includes: a receiver which receives a two-dimensional (2D) video signal; a communication unit which communicates with a content providing server providing a supplementary video signal for a three-dimensional (3D) video signal corresponding to the 2D video signal; a signal processor which processes the 2D video signal and the supplementary video signal; and a controller which controls the communication unit to receive the supplementary video signal corresponding to the received 2D video signal from the content providing server, and the signal processor to generate the 3D video signal based on the received supplementary video signal and the received 2D video signal. Accordingly, it is possible to generate and reproduce the 3D video signal corresponding to the 2D video signal.