A data storage apparatus includes a storage unit having a storage area. The data storage apparatus includes a read key registration unit registering a first read key that is transmitted from a first information processing apparatus and that permits reading data from the storage area; a write control unit controlling writing data in the storage unit so that writing new data in the storage area is prohibited until data stored in the storage area is read for the first time; and a read control unit controlling reading data from the storage unit so that reading data from the storage area is permitted if a second read key that is transmitted from the first information processing apparatus or a second information processing apparatus matches the first read key when reading data from the storage area is requested by the first information processing apparatus or the second information processing apparatus.