Since a editing character string is managed by an input server, an application device cannot know whether scrolling is necessary. Accordingly, there has been a problem that it is impossible to properly realize a scroll function. Accordingly, a receiving unit receives an instruction from a user operation or an application device, and a character string editing unit edits a character string according to the instruction received. Further, an output management unit manages output, and a state notifying unit notifies a change of the internal state to the application device. When a output area does not have enough empty space to display an editing character, the state notifying unit instructs the application device to shift the confirmed character string. The application device, upon receiving the instruction, scrolls the confirmed character string upward.