In modern capitalistic society, the harmed consumers like consumer complaints etc. are increasing day by day being caused by mass production and mass consumption etc. These consumer damages can come out as many types, but can be the most typical form. If there is a majority of the small sum damage, being saved by legal procedures is a fact that many consumers renounce it for long time, lots of expense and the complexity of the process etc. So, the government enforces consumer groups suit and collective dispute mediation system revising Framework Act on consumer. Specially, collective dispute mediation system, one of the ADR, saves the harmed consumers and accomodates efficiency in management of consumer dispute settlement commission by dealing with it collectively if the same or similar damage without a legal procedure happens to a great number of consumers. However, collective consumer dispute mediation system also has a number of problems. Therefore, this thesis is looking into the function and procedure of the collective consumer dispute mediation system on Framework Act on consumer as well as its problems and ways of improving it.