Abstract: This is the invention of the system and method for on-line advertisement involving easy, friendly and non-professional social commerce games such as ‘Rock-Scissors-Paper’, ‘Ladder Game’ or Dice Game’ by which users get interested in, in promotion of participation, and granted incentives according to the performance in the game. In other words, this invention is about favoring both users and advertisers by way of incentivizing participation and offering cost-efficient, methodical and ‘targeted’ means of on-line, real-time advertisement and service thereof. In establishment thereof, this invention is to establish, in offering the on-line advertisement system and service thereof, an Advertisement Registry, Social Advertisement Server (1) comprising Game Program Operator, Data Collator and Standings Manager, Advertiser's Server and User Server administering users being the subject of advertisement.