Patent ID: 8923833

Claim:
An information sharing system including a plurality of terminal devices used by members performing Push to talk over Cellular (PoC) communications, wherein the terminal devices include mobile phones used by members performing PoC, each of the mobile phones having a single screen operable and switchable with a use of multitask function, wherein each of the mobile phones comprises: a screen activating unit for partitioning the single screen into a plurality of partitioned views and simultaneously displaying the plurality of partitioned views on the screen of the terminal device, the plurality of partitioned views including a first partitioned view used for PoC communications, wherein the plurality of partitioned views include a second partitioned view, the second partitioned view used for communications other than the PoC communications, the plurality of terminal devices includes a first terminal device and a second terminal device, the screen activating unit of the second terminal device displays the first partitioned view of the first terminal device on the first partitioned view of the second terminal device, whereby the first and the second terminal devices share the first partitioned view, each of the terminal devices further comprising: a key input object screen switching device for switching and selecting an activated one of the plurality of partitioned views; and a key input object screen switching button for operating the key input object screen switching device, wherein: the key input object screen switching device is activated with the key input object screen switching button; a view to which information is input by using keys of a key input device is set to one of the plurality of partitioned views; when the view to which information is input is set to the first partitioned view, information is input to the first view using the key input device of the terminal device; and when the view to which information is input is set to the second partitioned view, information is input to the second view using the key input device of the terminal device.