To provide an information delivery system enabling an optional user to easily contribute information and achieving effective advertisement based on the information.

The information delivery system comprises an image database 38 storing a plurality of pieces of contributed image information; an advertisement database 40 storing a plurality of pieces of advertisement information registered beforehand; an image information delivery control means 90 for delivering image information stored in the image database 38 in response to a delivery request; an advertisement information detection means 92 for detecting whether registered advertisement information is included in the image information delivered by the image information delivery control means 90; and a jump information display control means 94 for displaying jump information for displaying a Web site registered beforehand when the predetermined advertisement information is detected by the advertisement information detection means 92. When the pre-registered advertisement information is included in the image information concerning the delivery, guidance to a Web site corresponding to the advertisement information can be given.