Program distribution server, method, program, and recording medium

摘要

A program distribution server distributes a plurality of software supplied from an external vender to a user terminal upon request. The program distribution server includes first information that relates to a function included in the software. Second information is included to specify the function of the software. A function is changed in accordance with upgrading of the software. Third information is also included to indicate a correspondence between the software and dependent software installed in the user terminal. The dependent software runs in dependence upon the software. The fourth information is also included to indicate correspondence between the function of the software used by the dependent software and the dependent software itself. The program distribution server determines possibility of updating of software to be distributed to the user terminal based on the first to fourth information.