16. The computer-readable recording medium according to claim 14 , wherein the similar-portion-merging further involves comparing the merged block information by identifying a variable based on the virtual portion.
14. The computer-readable recording medium according to claim 13 , wherein the macroblocking-analyzing further involves appending, to a number identifying a variable for a statement in each block, a virtual portion representing a number unique in the statement, the virtual portion being appended as the appendant information and to express the number for identifying the variable by a combination of a lower portion representing a number unique in the source code entirely and an upper portion made up of the virtual portion.