The present invention provides a method for enlarging 4K2K resolution and a 4K2K resolution enlarging system using the method. The method includes (1) providing a 4K2K resolution enlarging system, which includes a TV control terminal and a timing controller that includes a first port module, a FHD/QFHD signal processing module, 3a D/2D signal processing module, a 4K/2K signal resolution enlarging module, and a second port module connected to a source driver IC; (2) receiving the external data signal and carrying out processing of the data signal to provide an output of FHD/QFHD format data signal to the timing controller; (3) the timing controller carrying out panel-related computation with the FHD/QFHD signal processing module and the 3D/2D signal processing module; and (4) the 4K/2K signal resolution enlarging module carrying out enlargement of 4K2K and supplying an enlarged data signal to the source driver IC.