An image processing apparatus, comprising: an encoding section configured to encode prediction mode information of a prediction unit, PU, of a color component, wherein prediction mode information is a flag that indicates whether the prediction mode of a PU is an inter prediction mode or an intra prediction mode system prediction mode, and in a case where the flag indicates that the prediction mode of the PU is the intra prediction mode system prediction mode, the prediction mode information is said flag and a flag that indicates whether the prediction mode of a PU is either an intra block copy, intra BC, prediction mode, or an intra prediction mode indicating DC intra prediction, Planar intra prediction, and Angular intra prediction, characterized in that: the encoding section decides whether or not prediction mode information of a PU of a luminance component corresponding to the PU of the color component indicates that the prediction mode is the intra prediction mode system, and in the case where it is decided that the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra prediction mode system, the encoding section is configured to decide whether or not the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra BC prediction mode, in the case where it is decided that the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra BC prediction mode, the encoding section is configured to encode the prediction mode information of the PU of the color component by using, as a context in a context-based adaptive binary coding, CABAC, that the prediction mode of the PU of the luminance component is the intra BC prediction mode, wherein the encoding section is configured to set a probability model of the CABAC for the prediction mode information of the PU of the color component in such a way that the probability of the prediction mode information indicating the intra BC prediction mode becomes high. an encoding section configured to encode prediction mode information of a prediction unit, PU, of a color component, wherein prediction mode information is a flag that indicates whether the prediction mode of a PU is an inter prediction mode or an intra prediction mode system prediction mode, and in a case where the flag indicates that the prediction mode of the PU is the intra prediction mode system prediction mode, the prediction mode information is said flag and a flag that indicates whether the prediction mode of a PU is either an intra block copy, intra BC, prediction mode, or an intra prediction mode indicating DC intra prediction, Planar intra prediction, and Angular intra prediction, characterized in that: the encoding section decides whether or not prediction mode information of a PU of a luminance component corresponding to the PU of the color component indicates that the prediction mode is the intra prediction mode system, and in the case where it is decided that the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra prediction mode system, the encoding section is configured to decide whether or not the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra BC prediction mode, in the case where it is decided that the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra BC prediction mode, the encoding section is configured to encode the prediction mode information of the PU of the color component by using, as a context in a context-based adaptive binary coding, CABAC, that the prediction mode of the PU of the luminance component is the intra BC prediction mode, wherein the encoding section is configured to set a probability model of the CABAC for the prediction mode information of the PU of the color component in such a way that the probability of the prediction mode information indicating the intra BC prediction mode becomes high. the encoding section decides whether or not prediction mode information of a PU of a luminance component corresponding to the PU of the color component indicates that the prediction mode is the intra prediction mode system, and in the case where it is decided that the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra prediction mode system, the encoding section is configured to decide whether or not the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra BC prediction mode, in the case where it is decided that the prediction mode information of the PU of the luminance component indicates that the prediction mode is the intra BC prediction mode, the encoding section is configured to encode the prediction mode information of the PU of the color component by using, as a context in a context-based adaptive binary coding, CABAC, that the prediction mode of the PU of the luminance component is the intra BC prediction mode, wherein the encoding section is configured to set a probability model of the CABAC for the prediction mode information of the PU of the color component in such a way that the probability of the prediction mode information indicating the intra BC prediction mode becomes high.