Abstract
Present methods of service provision have proven insufficient to guide users efficiently to the mobile internet services they need. To solve this problem, the authors have been investigating a task-oriented menu which enables users to search for services by “what they want to do” instead of by “name of category”. Construction of such a task-oriented menu is based on a task ontology modeling method which supports the description of user activity such as task execution and the solving of obstacles encountered during the task. We also discuss a modeling method which supports the description of users' activity and related knowledge.