The purpose of this study is to develop a conversation assistive technology as a foundation of social networks in order to prevent cognitive decline and dementia of older adults. We developed the system that supports users for switching attention by using a robot. In the group conversation, the robot takes 4 kinds of actions aiming at supporting switching attention by revoicing. In order that older adults can achieve the task, we counted number of switching attention used in natural conversation of real older adults, then set the number as a target number of switching attention system induce. By using the system we conducted experiments for younger adults and older adults. As a result, the switching attention that the system induced reached the target number of switching attention in both younger adults and older adults. The system induced switching attention by not only revoice, but also other kinds of actions.
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