19. The system according to claim 17 , wherein said mutual dependencies comprises delivery costs to be added to the price of the selected entities to evaluate if a user may achieve the most cost efficient configuration of desired entities by taking delivery costs of the entities into consideration.
17. A system configured for searching for a combination of at least two different entities contained in web-based data sources, the system comprising a plurality of search engines established for extraction of data stored in at least two different web-based data sources, at least one of the search engines being implemented by means of at least one computer, the at least one computer comprising one or more central processing units, one or more memories and one or more network interfaces to one or more networks, the at least one computer further comprising a search engine comprising program code which, when executed on said one or more central processing units performs a search on the basis of user inputted search criteria, said search engine being configured for performing a search for a configuration of at least two different entities on at least two different web-bases data sources for said different entities, said configuration comprising a first entity and a second entity being includable in the at least two different entities that the system is configured to search for, said search engine presenting at least one found configuration of different entities by means of a user interface, said search engine availing an order input defining a configuration determined on the basis of said at least one found configurations presented by means of said user interface, said system taking mutual dependencies between said entities into consideration, and the user interface comprising at least one monitor displaying in dependency of said program code.