Image decoding method, image coding method, image decoding apparatus, image coding apparatus, and image coding and decoding apparatus

An image coding method of coding, on a per-block basis, to generate a bitstream including a coded image, the image coding method comprising:

• a first performing of arithmetic coding on a current block to be coded;
• a first determining of determining whether or not the current block is at an end of a slice;
• a second performing of setting an end-of-slice flag to a predetermined value of 1, when it is determined that the current block is at the end of the slice;
• a third performing of performing arithmetic coding termination as first termination when the end-of-slice flag indicates the predetermined value of 1;
• a second determining of determining whether or not the current block is at an end of a sub-stream when it is determined that the current block is not at the end of the slice, the sub-stream being a structural unit of the image that is different from the slice;
• a fourth performing of setting a sub-last bit to a predetermined value of 1, when it is determined that the current block is at the end of the sub-stream;
• a fifth performing of performing arithmetic coding termination, as second termination, which is triggered by the sub-last bit indicating the predetermined value of 1;
• and
• searching a beginning of a next sub stream,
• wherein, the second termination is same processing as the first termination, and
• wherein the first performing, the second performing, the first determining, the second determining, the fourth performing, and the fifth performing are repeatedly performed until the third performing is performed.