Abstract: Provided is a marketing system and method for a hearing aid. A customized inner ear type hearing aid is manufactured using measurement data collected from a plurality of users who demand customized hearing aids, and the collected measurement data is classified into a plurality of groups to generate representative measurement data of each group, thereby manufacturing a general-purpose inner eye type hearing aid. In addition, the manufactured general-purpose inner ear type hearing aid allows a user to directly perform hearing examination and fitting work, and so a user who wants to use a general-purpose inner ear type hearing aid may purchase a suitable general-purpose inner ear type hearing aid without any help of a specialist and use it instantly. Therefore, manufacturing and selling costs may be greatly reduced, and the hearing aid market may be expanded since hearing aids may be purchased at places ensuring each access of users.