Communication system, an electronic book terminal, a communication method, a program, and a recording medium

The first portion acquisition unit (111) from the user accepts the designation of the first portion included in the electronic book. First notice transmitting unit (112), a first notification for specifying the first portion, and transmits the e-book to another electronic book reader viewable. The second notification receiver (116), another electronic book terminal receiving the first notification, the first portion is specified by the first notification received by browsing to other users, it received from other users, when sending a second notification to specify a second portion included in the electronic book, which receives the second notification from the other electronic book terminal. Display control unit (114) causes the viewing a second portion which is specified by the second notification received to the user. Operation control unit (118), from the transmission of the first notification until it receives a second notification, ignoring the user's operation according to the reading of e-books.