Data block read-out control apparatus

A data block read-out control apparatus, comprising:

• an order buffer that stores an identifier sequence in which sort-unit identifiers corresponding to a plurality of data blocks stored in a plurality of reception buffers prepared for each sort unit are arranged in arrival order of the plurality of data blocks;
• a detecting unit that detects a head position of each of the sort-unit identifiers in the identifier sequence;
• a determining unit that determines a data block to be read out from one of the plurality of reception buffers, based on at least the head position of each of the sort-unit identifiers and a read-out rule of data blocks from the plurality of reception buffers defined in advance;
• and
• a reading-out unit that reads out the data block determined in the determining unit, from the one of the plurality of reception buffers,
• wherein the sort-unit identifiers are expressed by a minimum bit number to express all sort units corresponding to the data blocks stored in the plurality of reception buffers.