1. A learning support method with an on-line computer that holds a learning material content and intelligibility information, comprising: a learning material transmitting step for transmitting said learning material content to client machines; a receiving step for receiving information representing intelligibility of learners about said learning material content; an updating step for updating said intelligibility information based on the information representing intelligibility received in said receiving step; and an intelligibility information transmitting step for transmitting said intelligibility information to said client machines.