"Hippocampus" is a backup tool of memory. An unexpected idea, the heard information, etc. are easily recordable quickly in every day. – A text, a sound, and a photograph are put together and can be recorded. – Indicate the record by list at the order of the date. – Operate simply, lightweight, and at high speed. – The record saved can be edited easily. – Since it corresponds to speech recognition, a text can also be inputted from a microphone.