A writing information processing system includes a writing information generating device and an information processing device. The writing information generating device generates writing information relating to a user's writing operation on a medium. The information processing device acquires the writing information from the writing information generating device and stores the writing information. The writing information generating device includes an operation status detector and a visible light generator. The operation status detector detects a current operation status of the writing information generating device. The visible light generator generates visible light representing the detected current operation status of the writing information generating device.