Apparatus for correcting data of layout pattern

An apparatus for correcting data of a layout pattern, comprising:

• an edge extracting/dividing section which extracts a correction target edge from said layout pattern and divides said correction target edge into unit edges to be corrected;
• a permissible correction range setting section which sets lower limits and upper limits of movable ranges of said unit edges;
• an insufficient process margin part extracting section which extracts said unit edges whose process margins are insufficient by moving said unit edges within the movable ranges to perform simulation with process variations;
• a permissible correction range resetting section which newly sets movable ranges where process margins are not insufficient with regard to said unit edges whose process margins are insufficient;
• and
• a simulation correcting section which performs a correcting process by simulation to match a finished dimension of said layout pattern to an intended dimension based on the newly set movable ranges.