Conventional way of recording the daily life is to write a diary which can help the people recall what they did, but it is based on the human?s limited memory. Recent advances in pervasive and mobile technology allow us not only to log user?s daily activities (location, call log, SMS, and proximity information with Bluetooth) but also to store personal multimedia information (photo, video and documents), which contains private information to reveal user?s daily events. Exploiting the information in a full scale would give us a chance to produce innovative applications in accordance with personal preference and contexts.

Automatic diary generation from user?s log (explicit or implicit) is one of hot research topics. Sumi et al. designed comic diary to summarize the user?s conference tour in a comic form. Eagle et al. tried to develop a diary system based on the log information collected from cellular phone. Nokia?s LifeBlog provides a way to store and manage user?s photo, multimedia and SMSin a chronological manner.