A method for causing at least portions of display screens of a plurality of terminals connected to each other through a network to display information in a synchronous manner and participating in an electronic conference, the method comprising: receiving page information indicating information regarding a material to be displayed; receiving operation information indicating details of operations that users perform on the respective terminals, such as displaying a new page of the material, writing in a page of the material using a pen tool, creating a submission comment, picking up or selecting a submitted comment, switching pages of the material, inputting and moving a mouse pointer, and inputting sound; and recording minutes information in which the page information, the operation information, and time information indicating times at which the users perform the operations are associated with each other, wherein the operation information and the page information are recorded as different pieces of information rather than as integrated information, wherein the method further comprises: reproducing the minutes information based on a user's request, wherein the reproducing comprises: reading the material from a storage section that stores data of the material, displaying the read material on at least portions of display screens of a terminal through which the request is made, and reflecting, to the displayed material, the details of the operations corresponding to the operation information and the time information based on the minutes information, and wherein the recording further comprises adding to the minutes information another operation information indicating details of an operation that is performed on the terminal, through which the request is made, when the minutes information is being reproduced. receiving page information indicating information regarding a material to be displayed; receiving operation information indicating details of operations that users perform on the respective terminals, such as displaying a new page of the material, writing in a page of the material using a pen tool, creating a submission comment, picking up or selecting a submitted comment, switching pages of the material, inputting and moving a mouse pointer, and inputting sound; and recording minutes information in which the page information, the operation information, and time information indicating times at which the users perform the operations are associated with each other, wherein the operation information and the page information are recorded as different pieces of information rather than as integrated information, wherein the method further comprises: reproducing the minutes information based on a user's request, wherein the reproducing comprises: reading the material from a storage section that stores data of the material, displaying the read material on at least portions of display screens of a terminal through which the request is made, and reflecting, to the displayed material, the details of the operations corresponding to the operation information and the time information based on the minutes information, and reproducing the minutes information based on a user's request, wherein the reproducing comprises: reading the material from a storage section that stores data of the material, displaying the read material on at least portions of display screens of a terminal through which the request is made, and reflecting, to the displayed material, the details of the operations corresponding to the operation information and the time information based on the minutes information, and reading the material from a storage section that stores data of the material, displaying the read material on at least portions of display screens of a terminal through which the request is made, and reflecting, to the displayed material, the details of the operations corresponding to the operation information and the time information based on the minutes information, and wherein the recording further comprises adding to the minutes information another operation information indicating details of an operation that is performed on the terminal, through which the request is made, when the minutes information is being reproduced.