A non-transitory computer readable medium stores a program causing a computer to execute a process for displaying parts of display screens in synchronization across multiple terminals connected via a network. The process includes receiving connection requests from the terminals, granting to one of the terminals having transmitted the connection request an operation right to operate on materials that are displayed in synchronization, and notifying the terminals, other than the terminal that has been granted the operation right from among the terminals having transmitted the connection requests, of material information of the materials displayed on the terminal and operation information indicating contents of an operation performed on the materials.