A projector system includes: a plurality of computers connected to a network; and a plurality of projectors connected to the network, wherein each of the computers includes a connection request unit which gives a connection request to an arbitrary projector connected to the network, and each of the projectors includes a group information acquisition unit which acquires group information including apparatus IDs of the respective projectors of a group to which the own apparatus belongs, and a connection request unit which requests the projectors excluding the own apparatus among the projectors of the group to connection with an arbitrary computer, referring to the group information, when receiving the connection request from the arbitrary computer.