Abstract. In Japan, a Group Home which offers home-based care service for elderly persons who suffer from dementia have been increased. Even though the small community of the home is suitable for familylike care, the short of caregivers increases the burden especially during midnight. To supplement the lack of attention, we developed floor mats embedded with RFID antenna and slippers with RFID tags. The system can help the caregivers to aware activities of the persons with dementia by specifying whether the person passed through the sheet on the corridor. It not only helps the caregivers to understand such persons by reviewing their activities but also keeps them informed about the person's ongoing activities. Key words: Ubiquitous Home, Elderly Persons Care, Lifelong Computing