| 摘要 |
A data reception apparatus that includes a storage unit 263 for storing a direct directory message body specifying a data block identifier by the reference name, a key information selection unit 258 for obtaining the reference name, a reception unit 152 for receiving multiplexed data of indirect directory message blocks, data blocks, and the direct directory message body data, a separation unit 254 for separating the multiplexed data, a directly obtaining unit 264 for outputting the data block identifier using the direct directory message body, a selection unit 155 for outputting the identifier using indirect directory message bodies, a directory message body obtaining unit 156, an indirect obtaining unit 257, a data block selection unit 253 for selecting the data block according to the output identifier and for extracting a data file, a selection unit 261 for restoring and storing the direct directory message body, and a restoration unit 262. When a direct directory message body includes a reference name, a data block identifier may be directly specified by the reference name without tracing indirect directory message bodies, and when a direct directory message body does not include a reference name, another direct directory message body is obtained and stored. As a result, the time for reception process is reduced.
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