A conference supporting system includes plural input terminals and a control apparatus connected through a network. Each input terminal includes a processor and a display screen configured to allow a user to perform handwriting input thereon and to display the data. The processor of each input terminal is configured to perform making a user to choose who acquires an access right, making a request to acquire the access right to the control apparatus, and transmitting handwriting data to the control apparatus. The processor of the control apparatus is configured to perform granting an access right of a part or whole of the area determined by the user, giving one of the input terminals a notice about the granted access right, transmitting the handwriting data to other input terminals and operating the display screen of each of the other input terminals to display the handwriting data.