1. A learning support method with an on-line computer that holds a plurality of learning materials, explanations to describe said contents in detail and relevance information that gives indication to choose at least one of said explanations, said method comprising: a learning material transmitting step for transmitting one of said learning materials to a client machine; a response information receiving step for receiving response information of learners about the transmitted learning material from said client machine; an explanation choice transmitting step for transmitting explanation choice information including headings of said explanations corresponding to the transmitted learning material and said relevance information when said response information represents that the learner did not understand said learning material; a choice information receiving step for receiving information representing which explanation the learner chose based on the transmitted headings; and an explanation transmitting step for transmitting the chosen explanation to said client machine.