| 摘要 |
PROBLEM TO BE SOLVED: To obtain a novel and enhanced user interface for a telephone handset by generating a popup window that shares part of a display menu and includes a permitted operation, when a control unit receives a request. SOLUTION: Part of a roller main body 20 is extended via a close contact fitting (without making contact) opening of a front face cover of the telephone set. When the roller main body 20 is depressed, the entire navigation and selection key structure executes a rocking motion around a hinge shaft decided by grip means 28, 34. When the roller main body 20 of the navigation and selection key is depressed, provision for making access to a telephone menu is instructed. The display includes some state indications such as a battery level, quality of RF connection and a local time. That is, both the option and the navigation are integrated in the roller main body 20.
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