A lecture system comprising: a first display section set on one side surface of a wall that divides one room into two rooms (A,B), set to be seen by participants present in a first room, which is one of the two rooms in which the one room is divided, and configured to display a material of a lecture; a second display section set on a side surface on the opposite side of the surface of the wall on which the first display section is set, set to be seen by participants present in a second room, which is the other room of the two rooms in which the one room is divided, and configured to display a material including content same as content of the material displayed by the first display section; a first image pickup section disposed in the first room and configured to pick up an image of a lecturer; a server configured to receive the image picked up by the first image pickup section and create an image formed by segmenting the image of the lecturer; and a first projecting section configured to project the image created by the server toward the wall of the second room and further comprising: a sensor (11, 12) set in a passageway between the first room and the second room and configured to detect passage of the lecturer; a second image pickup section disposed in the second room and configured to pick up an image of the lecturer; and a second projecting section configured to project, toward the wall of the first room, an image created by the server on the basis of the image picked up by the second image pickup section, wherein when the sensor (11,12) detects the passage of the lecturer, the server starts the second image pickup section, stops the first image pickup section, receives the image picked up by the second image pickup section, creates an image formed by segmenting the image of the lecturer, transmits the created image to the second projecting section and stops said first projecting section. a first display section set on one side surface of a wall that divides one room into two rooms (A,B), set to be seen by participants present in a first room, which is one of the two rooms in which the one room is divided, and configured to display a material of a lecture; a second display section set on a side surface on the opposite side of the surface of the wall on which the first display section is set, set to be seen by participants present in a second room, which is the other room of the two rooms in which the one room is divided, and configured to display a material including content same as content of the material displayed by the first display section; a first image pickup section disposed in the first room and configured to pick up an image of a lecturer; a server configured to receive the image picked up by the first image pickup section and create an image formed by segmenting the image of the lecturer; and a first projecting section configured to project the image created by the server toward the wall of the second room and further comprising: a sensor (11, 12) set in a passageway between the first room and the second room and configured to detect passage of the lecturer; a second image pickup section disposed in the second room and configured to pick up an image of the lecturer; and a second projecting section configured to project, toward the wall of the first room, an image created by the server on the basis of the image picked up by the second image pickup section, wherein when the sensor (11,12) detects the passage of the lecturer, the server starts the second image pickup section, stops the first image pickup section, receives the image picked up by the second image pickup section, creates an image formed by segmenting the image of the lecturer, transmits the created image to the second projecting section and stops said first projecting section.