1. A query system for carrying out a query process corresponding to a received query element on a database system and/or a search-engine system, the query system comprising: a synchronisation unit operable, as a non-text-centric synchronisation process, to convert a non-text-centric data entry of the database system into a corresponding text-centric data entry representative of the non-text-centric data entry, and to enter the text-centric data entry into an index of the search-engine system making the non-text-centric data entry of the database system available to both the search-engine and database systems.