Abstract
Although such information services as FM-VICS, gas stations, sales at department stores etc., contribute to car drivers for their safety and satisfaction in driving situation, it is hard for them to retrieve such information while driving. It is also difficult to push all such information without any control which should disturb driver's concentration on driving. The authors have been investigating a task-oriented menu, which enables users to search for mobile internet services by what they want to do and not by category. We have built a task model of the mobile users' daily activities and reorganized "contexts" in the model to develop a menu hierarchy from the view point of the task. We have applied the framework to modeling car drivers' activities. Such models indicate when and what kind of information should be provided in the car, which in turn contribute to design ambient interface for the drivers.
