An extracting unit extracts, from a collection of procedure information sets individually indicating operating procedures for configuration modification of systems according to contents of the configuration modification, in which operating procedures specific information pieces of the individual systems have been replaced with individually corresponding variable names, a procedure information set indicating an operating procedure according to a content of the configuration modification to be applied to a modification-target system. A replacing unit replaces a variable name in the extracted procedure information set with a corresponding specific information piece of the modification-target system, which specific information piece is acquired from a configuration information set defining a configuration of the modification-target system.