An image decoding method according to the present invention comprises the following steps: deriving a peripheral prediction mode information from a left peripheral prediction mode and an upper peripheral prediction mode; deriving an intra prediction mode for a decoding target unit using the derived peripheral prediction mode information; and performing an intra prediction on the decoding target unit based on the derived intra prediction mode. The left peripheral prediction mode is an intra prediction mode of a left peripheral unit adjacent to the left of the decoding target unit. The upper peripheral prediction mode is an intra prediction mode of an upper peripheral unit adjacent to the upper of the decoding target unit. The peripheral prediction mode information includes a mode number of the left peripheral prediction mode and a mode number of the upper peripheral prediction mode. According to the present invention, image encoding/decoding efficiency can be improved.
/ METHOD FOR CODING/DECODING OF INTRA PREDICTION MODE AND COMPUTER READABLE REDORDING MEDUIM THEREOF