We propose an augmented experiences behavior simulator for understanding Behavioral and Psychological Symptoms of Dementia (BPSD). Dementia is a decline in cognitive function. The symptoms such as wandering and delusion appear depending on demented person’s personality and situation. Designing the knowledge structure for representing BPSD behavior, we have developed the trial multimodal knowledge content for caregivers and demented people, and have shown the effectiveness of the BPSD simulator.