An information management apparatus includes at least one processor configured to execute a program stored in a storage. The at least one processor acquires sequentially captured frames. The at least one processor acquires a movement state of a position of a light source in an imaging area, based on light source images contained in the acquired frames. The light source transmits information by means of light including an illumination pattern of the light. The at least one processor causes the storage to store the information and the movement state in association with each other.