PURPOSE: To use a using processor without waste so as to flexibley correspond to a processing even if the number of horizontal picture elements in respective signals becoming processing objects differ.

CONSTITUTION: A first shift register 102 serial/parallel-converts input serial data and parallel data outputted from it is processed by plural processors 104. Parallel data outputted from the processors are parallel/serial-converted by a second shift register 106. In such a case, a selector 101 is provided as the constitution of a block unit and the outputs of the first and second shift registers in a prestage are selectively guided. When plural blocks are connected, the various connection patterns of a block group can be varied.