Inter-layer prediction method and encoding device and decoding device using same

A decoder comprising:

• a reception module to receive a bit stream comprising video information on a multilayer;
• a prediction module to perform prediction for a video of a current layer using video information on a reference layer;
• and
• a memory to store information necessary for the prediction,
• wherein the prediction module predicts a current block using information on a reference block in the reference layer, and
• the reference block is specified on the basis of a reference position which is a position in the reference layer corresponding to a current position in the current layer for specifying the current block.

An encoder comprising:

• a prediction module to perform prediction for a video of a current layer using video information on a reference layer;
• a memory to store information necessary for the prediction;
• and
• a transmission module to transmit a bit stream of a multilayer comprising predicted information,
• wherein the prediction module predicts a current block using information on a reference block in the reference layer, and
• the reference block is specified on the basis of a reference position which is a position in the reference layer corresponding to a current position in the current layer for specifying the current block.