To increase the effect of campaign information use for users and the effect of campaign information provision for campaign providers.

Pieces of campaign information from campaign provider terminals 10 are stored in a storage part 22 on an advertising agent server 20. When a campaign information transmission request signal is received from a user terminal 30, a processing part 23 on the advertising agent server 20 takes campaign information meeting selection conditions that the campaign information transmission request signal indicates among the pieces of campaign information out of the storage part 22 and sends it to a user terminal 30 to display it at a display part 32.