Apparatus and system for viewing 3d image

3D video viewing apparatus, and system are disclosed. The 3-D image viewing apparatus, the 3D image synchronization signal the synchronization signal receiving unit for receiving, generating 3D control signal to generate the left-eye glass control signal and the right eye glass control signal according to the synchronization signal received from the synchronization signal receiving unit, right eye glass portion of the light passing through a right-eye glass according to the left-eye glass portion, the right-eye glass control signal to open or to block the light passing through a left-eye glass according to the left-eye glass control signal opens or blocks, received from the synchronization signal receiving unit the in accordance with the synchronization signal controls the operation of the 3D control signal generating section and connected or cut off power to the 3D driving signal generation part is supplied to a central processing unit, and the synchronization signal receiving unit and the central processing unit for transmitting said synchronization signal and a power control unit. According to this invention such a synchronous signal is supplying power to the synchronization signal receiving unit and the central processing unit only when the received and it is possible to minimize the power consumption of the 3-D image viewing apparatus by cutting off the power in the remaining region.