A display system, a source driving apparatus, and a method of black insertion are provided. The apparatus includes a data channel, a black-insertion-data line, a first and a second selector. In a first period, the first selector electrically connects the data channel to a first data line in a display panel, and the second selector electrically connects the black-insertion-data line to a second data line in the display panel. In a second period, the first selector electrically connects the data channel to the second data line, and the second selector electrically connects the black-insertion-data line to the first data line.