The invention provides a frequency de-interleaving and time de-interleaving circuit, a frequency de-interleaving and time de-interleaving method, and a receiving circuit of a digital television. The receiving circuit of the digital television, which is used for processing a digital television video signal to generate transmission data, comprises a front-end circuit used for processing the digital television video signal to generate an interleaved signal, a setting unit used for providing a set value related to the digital video standard of the digital television video signal, a frequency de-interleaving and time de-interleaving circuit used for selecting frequency de-interleaving operation methods and time de-interleaving operation methods corresponding to different digital video standards according to the set value and processing the interleaved signal to generate a de-interleaved signal, a quadrature amplitude modulation de-mapping circuit used for mapping the de-interleaved signal to generate a de-mapped signal, and a decoder used for decoding the de-mapped signal to generate the transmission data.