Entropy decoding method, and decoding apparatus using same

A method for image decoding performed by a decoding apparatus, the method comprising:

• decoding bins of a bin string for a syntax element intra_chroma_pred_mode to derive a value of the syntax element intra_chroma_pred_mode, wherein at least one bin of the bin string is decoded based on context information and the rest bins of the bin string are decoded based on bypass decoding;
• deriving a chroma intra prediction mode of a current block based on the value of intra_chroma_pred_mode;
• deriving prediction samples of the current block based on the chroma intra prediction mode;
• generating reconstructed picture based on the prediction samples.