To assign a certain amount of data to a video image with a low-level for difficulty of coding, in the encoding processing by a 2-path encoding system.

The video input part 11 inputs video data D11 to be encoded and supplies it to a noise addition part 12 and an encoder 13. The noise addition part 12 generates pseudo noise, superimposes it on the video data D11 supplied from the video input part 11, and supplies the video data D11', to which the pseudo noise obtained as a result, is added, to the encoder 13. The encoder 13 executes encoding processings by a 2-path encoding system, by using the video data D11 and video data D11'. The present invention is applicable to authoring devices.