Patent ID: 8521840

Claim:
A network system, comprising: a server device to store one or a plurality of contents; and a plurality of replay devices, each of which receives respective contents which are desired by a user, are specific to the replay device, and are transmitted from the server device, the replay devices being connected with the server device via a network, wherein each of the replay devices comprises: a specific list storage unit to store a first specific list which is a content list specific to the replay device, the content list including information of the respective contents, an individual shared list storage unit to store a shared list which is a content list which is shared among the plurality of replay devices, an obtaining unit to obtain a second specific list stored in the specific list storage unit of another of the plurality of replay devices, wherein the obtaining unit is configured to obtain the second specific list directly from the other replay device via the network, a storage control unit to store the second specific list obtained by the obtaining unit in the specific list storage unit of the replay device, an editing unit to carry out an editing process of the shared list which is stored in the shared list storage unit, and an updating unit to transmit the edited shared list to the other replay devices as a first update list, or to update the shared list storage unit based on a second update list received from another replay device, wherein: if the shared list stored in the shared list storage unit of the replay device is edited by the replay device, the corresponding shared lists stored in the respective shared list storage units of the other replay devices are updated, and if the first specific list or the second specific list stored in the specific list storage unit of the replay device is edited by the replay device, the other replay devices are not updated, the updating unit transmits the first update list to the server device, and the updating unit receives the second update list from the server device if the second update list cannot be received directly from the other replay device.