PURPOSE: To improve a searching performance of a radar system by making cell average soft, and executing the operation variably by the environment of the radar system.

CONSTITUTION: First and second cell average processing parts 305, 306, which execute cell averaging (adaptably set critical values), execute the cell averaging through a software program which is not a hardware means. The software program executed at this time is downloaded from the main control part of a radar system to the processing parts 305, 306 through a communication processing part 311. Thus, the user of the radar system can change the software program. An extractor 308 removes a no-signal data showing the absence of a target of the data outputted from the processing part 306, and applies 309 it. A radar video processor control part 310 executes the function for generating various clocks and control signals so that each circuit variably executes its operation.