The size of an image file is not influenced even if location information is added or deleted after storing the image file. To achieve this, when an image is stored on a storage medium, whether GPS measurement was successful is determined. If measurement was successful, information indicating the existence of location information is stored in a first area as attribute information compliant with the image file format, the acquired location information is stored in a second area as attribute information, and the image is stored in a predetermined format. If not, information indicating the existence of location information is stored in the first area, predetermined information is stored in the second area, a reserved area having a pre-set size is allocated in a continuous area that follows the second area, and the captured image is stored.