A transmission apparatus, comprising: an image encoding unit adapted to perform hierarchical encoding on image data of pictures constituting moving image data, wherein the multiple hierarchies are divided into at least a lower hierarchy group and a higher hierarchy group and to generate a first video stream including encoded image data of pictures of the lower hierarchy group and a second video stream including encoded image data of pictures of the higher hierarchy group, the encoded image data having a network abstraction layer, NAL, unit structure; and a transmission unit adapted to transmit a transport stream including the first video stream and the second video stream generated in the image encoding unit, and identification information including a level specification value indicating the hierarchy group to which the encoded image data of the pictures included in each video stream belongs, wherein the level specification value is set to a first value indicating the lower hierarchy group and is set to a second value indicating the higher hierarchy group, wherein the first value corresponds to a frame rate constituted of pictures of the lower hierarchy group and the second value corresponds to a frame rate constituted of pictures of the higher hierarchy group and the lower hierarchy group, wherein the identification information is inserted into a network abstraction layer unit of a sequence parameter set and a video parameter set of the first video stream. an image encoding unit adapted to perform hierarchical encoding on image data of pictures constituting moving image data, wherein the multiple hierarchies are divided into at least a lower hierarchy group and a higher hierarchy group and to generate a first video stream including encoded image data of pictures of the lower hierarchy group and a second video stream including encoded image data of pictures of the higher hierarchy group, the encoded image data having a network abstraction layer, NAL, unit structure; and a transmission unit adapted to transmit a transport stream including the first video stream and the second video stream generated in the image encoding unit, and identification information including a level specification value indicating the hierarchy group to which the encoded image data of the pictures included in each video stream belongs, wherein the level specification value is set to a first value indicating the lower hierarchy group and is set to a second value indicating the higher hierarchy group, wherein the first value corresponds to a frame rate constituted of pictures of the lower hierarchy group and the second value corresponds to a frame rate constituted of pictures of the higher hierarchy group and the lower hierarchy group, wherein the identification information is inserted into a network abstraction layer unit of a sequence parameter set and a video parameter set of the first video stream. the first video stream and the second video stream generated in the image encoding unit, and identification information including a level specification value indicating the hierarchy group to which the encoded image data of the pictures included in each video stream belongs, wherein the level specification value is set to a first value indicating the lower hierarchy group and is set to a second value indicating the higher hierarchy group, wherein the first value corresponds to a frame rate constituted of pictures of the lower hierarchy group and the second value corresponds to a frame rate constituted of pictures of the higher hierarchy group and the lower hierarchy group, wherein the identification information is inserted into a network abstraction layer unit of a sequence parameter set and a video parameter set of the first video stream.