A non-transitory computer-readable storage medium that stores a concealment determination program causing a computer to perform a process including determining whether, upon reception of a request to update data stored in a storage unit, the data that is updated is to be concealed based on the updated data, storing a result of the determining in the storage unit in association with the updated data, and determining, upon reception of a request from a device to read out the updated data, whether to return the updated data to the device by referring the result of the determining associated with the updated data.
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