Device, system, control method, and non-transitory computer-readable storage medium

A device that can at least store a captured image and is attached/detached to/from an image capturing apparatus which includes a mounting part to/from which the device can be attached/detached is provided. The device has functions of obtaining image data related to an image captured by the image capturing apparatus, executing analysis processing on the image data, storing the image data and a result of the analysis processing on the image data. The device executes control not to store the first result in a case in which a first result of the analysis processing is the same as a second result of previously executed analysis processing that is stored, and to store the first result in a case in which the first result is different from the second result.