1. An error concealment method comprising: determining a reference direction of a lost frame by determining whether a scene change between frames has occurred based on the lost frame; extracting concealment reference points for a pixel of the lost frame by using at least one frame other than the lost frame according to the determined reference direction; obtaining a concealment pixel value of the pixel of the lost frame by giving weight values to the extracted concealment reference points; and restoring the lost frame by concealing the pixel using the concealment pixel value.