A method of configuring candidate intra modes and a video decoding apparatus are disclosed. At least one embodiment of the present disclosure provides a method of configuring candidate intra modes for a chroma block, including determining whether a luma region corresponding to the chroma block has an encoding mode that is available for use, setting a direct mode (DM) among the candidate intra modes as a default mode when the encoding mode of the luma region is not available, and configuring the candidate intra modes by including the DM.