The purpose of educational technology is to expand educational resources to learn not only in school textbooks, teachers and teaching materials only. The concept of educational technology need to have the opportunity to learn from the extensive knowledge sources, such as method, technique, teaching.in the past, taught by professors tell content. But the present opportunity students study data manually. Teacher planning guidance. Psychologists are trying to figure out how to bring the teaching system in private lessons instead of using a teacher; but think the program "learning", which acts in teaching in the classroom by ourselves. Or through various media. Fast or slow, depending on the capabilities of each student.