To efficiently communicate information between a teacher and a student in a school.
The intra-school network is provided with a bulletin-board means 40 to distribute a message 42b inputted in a teacher terminal 20 to a student terminal 30 and to display the message on the student terminal 30, and with an attendance state management means 50 to display the student's attendance state 52b inputted in the student terminal 30 on the teacher terminal 20. Communication of a message 42b from a teacher to a student and of attendance state 52b from a student to a teacher is carried out using the teacher terminal 20, the student terminal 30 and a server 10, and the information is displayed on each terminal. The message is surely communicated since it is not misheard like in the case of oral communication, and time and labor for printing it out or writing it down on paper can be saved.