To tell the truth, it depends on how people in the industry define these two things and the curriculum content of major universities.

I can tell you that the teaching contents of the above two are similar in China, and there is no difference.

If you have to say affiliation, it's hard to say:

Graphic design doesn't have to be applied to advertisements. All designs with print media are graphic designs, so advertising design can belong to graphic design.

According to the media, advertisements can be divided into TV advertisements, newspaper advertisements and outdoor advertisements. According to the division of labor, advertising planning, copywriting and other designs are only part of it. Therefore, the graphic design of advertising should belong to advertising design.

If the existing colleges and universities in China classify the above accurately, if you prefer the design itself, it is recommended to learn graphic design; If you prefer advertising, study advertising design.

But most places are the same.

Good luck ~