To provide a network advertising server which cannot be accessed while excluding advertisement.

The server is provided with an advertisement storage means for storing about advertisement or an advertisement feeding means 2A and a contents storage means 3B for storing about contents or a contents feeding means 3A. When a network address being controlled or a channel URL being a URL, etc., is requested, one element included in the set of advertisements which can be obtained from the mans 2B or the means 2A or the set of contents which can be obtained from the means 3B or the means 3A is decided to provide the element. A random number generation means can be used for deciding the element. The history of the provided element is stored lest the same element is provided frequently at short intervals. Furthermore, a senareo for providing the element can be set. A client system repeating channel requests automatically is provided.