Multiple quality image contents service system and upgrade method thereof

A multiple quality image contents service system and an upgrade method thereof are provided to maximize a reuse rate of a channel bandwidth required to improve a service quality. A first stage encoder(220) encodes a raw image data(210) into a coding rate corresponding to a channel bandwidth(B1). By using a coding parameter a second stage encoder(230) additionally extracts upgraded visual content data which is not possible to provided only with a basis layer data(P1) from original image data. The second stage encoder produces a supplementary data(P2) with reference to a substitution range size which is provided in order to encode basis layer data from basis video data. A third stage encoder(240) extracts only visual content data from an original image data which is corresponding to the upgrade level which is not possible to provide to basis layer data and supplementary data. The third stage encoder produces a supplementary data(P3) from a basis video data with reference to the substitution range size of basis layer data and supplementary data.