Abstract: In a user terminal, an app having a function for assigning a pre-determined area on the screen of the user terminal as an advertisement posting area, and a function for receiving said set-up instruction in order to designate said advertisement posting area, is installed. When an advertisement agent server receives a set-up instruction from a user terminal, the advertisement server sends the advertisement to the user terminal, thus the advertisement is displayed on the advertisement posting area which is set up in accordance with the set-up instruction by the app. User inconveniences are minimized by posting advertisement on a user designated area.