Video decoding method and apparatus

A video decoding system for decoding an input bitstream in which each of pictures has been encoded with being split into a plurality of tiles, the video decoding system comprising:

• a partial decoding information generator configured to generate the input bitstream by resetting partial decoding information set to a null value or a default value in a predetermined field of a bitstream received from a video encoding apparatus in accordance with an external control signal for determining execution of partial decoding;
• and
• a video decoding apparatus configured to determine one or more target tiles to be decoded among the plurality of tiles by decoding the partial decoding information included in the input bitstream and to decode video data of the input bitstream corresponding to the one or more target tiles,
• wherein the partial decoding information comprises at least one of first information indicating whether to perform partial decoding and second information indicating an area on which partial decoding is to be performed.