The Parts mediation service integrates and provides distributed information sources on internet environments. Researches to integrate information sources through standardization are in progress. Standardization makes managing parts data easier. But, many companies already have own representation scheme of parts data. So, we need to provide these representations to the users. The PLIB data dictionary defines the representation of parts data. This extensible and flexible representation allows conversion between diverse representations of parts data. This thesis analyzes the data dictionary heterogeneity in order to provide the integrated parts data with diverse data dictionaries, on the bsasis of researches about database schema heterogeneity. Also, this thesis proposes and implements methodology of mapping and conversion between data dictionaries.