An encoding system capable of preventing the overflow of a buffer and performing the encoding of a VOP within a predetermined time period even where the processing time period necessary for encoding each macroblock is not constant. The system has a server which stores page descriptors. The positive electrode is similarly disposed away from the airway such as, for example, near the forehead. The CCS for the rock in the depth of cut zone is calculated by adding the estimated change in strength to the UCS. External connection terminals are provided on a surface of the second interposer opposite to the surface on which the second semiconductor element is mounted.