13. A computer-readable recording medium storing therein a module generating program that causes a computer to execute: parsing involving syntax analysis of a source code for a program and obtaining information concerning the syntax analysis; macroblocking-analyzing involving segmentation of the program into a plurality of blocks through structural analysis of the program based on syntax analysis information obtained from the parsing, obtaining block structure information as a result of the segmentation, and obtaining appendant information for virtualizing a calculation pattern of each block; junction-node-restructuring based on the block structure information and the appendant information and involving, focusing on one block defined as a subroutine, extracting a node directly related to the block of focus by tracing back a processing sequence to a node that is in an ancestor block upstream in the processing sequence from the block of focus and from which the block of focus is reached as a result of sequential processing, and by tracing the processing sequence to a node that is in a descendant block downstream in the processing sequence from the block of focus and that is processed after the block of focus; identical-portion-merging that, with respect to a plurality of portions that use the block of focus extracted from the program at the junction-node-restructuring, involves comparing nodes in ancestor blocks of the block of focus, merging the ancestor blocks, comparing nodes in descendant blocks of the block of focus, merging the descendant blocks, and obtaining merged-block information as a result of the merging of the ancestor blocks and of the descendant blocks; similar-portion-merging that, with respect to a second block of focus extracted from the program at the junction-node restructuring, involves comparing the merged-block information to define, as subroutines of an identical type, a plurality of blocks of focus that have similar or identical merged block information, further merging similar or identical merged block information, and obtaining abstracted code information as a result of the merging; and intermediate-language-restructuring that obtains information concerning a commonized component, based on the abstracted code information and the syntax analysis information.
13. A computer-readable recording medium storing therein a module generating program that causes a computer to execute: parsing involving syntax analysis of a source code for a program and obtaining information concerning the syntax analysis; macroblocking-analyzing involving segmentation of the program into a plurality of blocks through structural analysis of the program based on syntax analysis information obtained from the parsing, obtaining block structure information as a result of the segmentation, and obtaining appendant information for virtualizing a calculation pattern of each block; junction-node-restructuring based on the block structure information and the appendant information and involving, focusing on one block defined as a subroutine, extracting a node directly related to the block of focus by tracing back a processing sequence to a node that is in an ancestor block upstream in the processing sequence from the block of focus and from which the block of focus is reached as a result of sequential processing, and by tracing the processing sequence to a node that is in a descendant block downstream in the processing sequence from the block of focus and that is processed after the block of focus; identical-portion-merging that, with respect to a plurality of portions that use the block of focus extracted from the program at the junction-node-restructuring, involves comparing nodes in ancestor blocks of the block of focus, merging the ancestor blocks, comparing nodes in descendant blocks of the block of focus, merging the descendant blocks, and obtaining merged-block information as a result of the merging of the ancestor blocks and of the descendant blocks; similar-portion-merging that, with respect to a second block of focus extracted from the program at the junction-node restructuring, involves comparing the merged-block information to define, as subroutines of an identical type, a plurality of blocks of focus that have similar or identical merged block information, further merging similar or identical merged block information, and obtaining abstracted code information as a result of the merging; and intermediate-language-restructuring that obtains information concerning a commonized component, based on the abstracted code information and the syntax analysis information. 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.