Method and apparatus for encoding/decoding image using single coding mode

The present invention relates to an encoding method and apparatus of the image relates to a decoding method and apparatus of the image, using a probability model having a probability value of the same syntax elements to at least two image components each of the context index value the binary value of the syntax element can be enhanced by performing the binary arithmetic coding or binary arithmetic decoding encoding efficiency and decoding efficiency for the binary value of the syntax element.