Computerized method of creating a convenient dictionary representing data structures for use by a plurality of program products

A computer system comprises program products represented by a database management system, a first dictionary for registering and managing the definition data required for executing each of the program products and a second dictionary for storing and managing the structure definition data of the first dictionary. Each of the program products, for example a database system and a system development support tool, has added thereto in advance their structure definition data relating to all the definition data including the data required for executing each of the program products. The computer system creates the first dictionary on the basis of the structure definition data held by the program products in response to the demand for creating the first dictionary.