In Japan, there are moves to implement and disseminate Advanced Placement by the college board. The Japanese government is also beginning to consider creating similar programs and the system which high school students acquire college credits is drawing attention. However, there are cases where the accelerated learning system, which is a general name for such systems, and Advanced Placement which is only one of its forms are being confused, causing inaccurate understanding. Considering this situation, this paper aims to clarify the relative features of Advanced Placement by grasping the types of accelerated learning system in the U.S. and Japan. As a result, the existing accelerated learning system in Japan was able to be understood by two axes: (1) "Open-Closed, " (2) "overseas oriented (studying abroad)-domestic oriented." Advanced Placement belongs to "Open-overseas oriented" and draws a clear line from the existing system that is domestic oriented. Through this analysis, it reconfirmed the importance of not looking at all of the accelerated learning systems as similar cases, but classifying and understanding them separately.