In related art, it is not considered that the image quality of video to be transmitted can be improved in consideration of a delay time in video transmission. An image information coding method includes an analyzing step of analyzing an input image, a quantization parameter calculating step of calculating a quantization parameter by using analysis results in the analyzing step, and an encoding step of encoding the input image by using the quantization parameter calculated in the quantization parameter calculating step, wherein a first region to be analyzed in the analyzing step has a variable size.