Image encoding and decoding method supporting plurality of layers and apparatus using same

A method for decoding a video supporting multiple layers, comprising:

• generating an inter-layer reference picture set for at least one reference layer capable of being referred to by a current picture;
• generating a reference picture list including the inter-layer reference picture set and a temporal reference picture set;
• obtaining a prediction block of a current block in the current picture by performing prediction of the current block based on the reference picture list and a reference picture index of a current block;
• obtaining a residual block of the current block;
• and
• generating a reconstruction block of the current block by adding the prediction block and the residual block,
• wherein the temporal reference picture set comprises at least one of a short-term reference picture set or a long-term reference picture set, and
• wherein the inter-layer reference picture set comprises a first sub-reference layer picture set and a second sub-reference layer picture set,
• wherein the first sub-reference layer picture set is arranged, in the reference picture list, between a first short-term reference picture set including short-term reference pictures having POCs less than POCs of the current picture and a second short-term reference picture set including short-term reference pictures having POCs greater than POCs of the current picture and
• the second sub-reference layer picture set is arranged, in the reference picture list, at the end of a long-term reference picture set including long-term reference pictures,
• wherein the temporal reference picture set and the inter-layer reference picture set belong to different layers.