| 摘要 |
The ALM tree constructing apparatus (100) includes: a metric measuring unit (101) measuring an upload link bandwidth for each of terminals; a node allocating unit (202) allocating, to each of the terminals, at least one of (i) an upper terminal and (ii) one or more lower terminals; a first branch allocating unit (203) allocating at least a part of the upload link bandwidth which is assigned to each of the terminals that has the lower terminal allocated, so that the part of upload link bandwidth acts as a logical first branch for distributing the data stream; and a second branch allocating unit (402) allocating a remaining bandwidth, unused as the logical first branch, to a terminal provided in a hierarchy level below the terminal having the remaining bandwidth, so that the remaining bandwidth acts as a logical second branch for distributing reference data regarding the data stream.
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