11. The apparatus according to claim 8 , wherein the tempo word set constructing unit comprises: a fault-tolerant tempo word generating unit, configured to generate a plurality of fault-tolerant tempo words, each fault-tolerant tempo word being generated for a corresponding one of the tempo words.
11. The apparatus according to claim 8 , wherein the tempo word set constructing unit comprises: a fault-tolerant tempo word generating unit, configured to generate a plurality of fault-tolerant tempo words, each fault-tolerant tempo word being generated for a corresponding one of the tempo words. 12. The apparatus according to claim 11 , wherein the fault-tolerant tempo word generating unit comprises: a first fault-tolerant subunit, configured to select one or more tempo scales contained in a first tempo word; and a second fault-tolerant subunit, configured to replace the tempo scales in said first tempo word with corresponding fault-tolerant tempo scales to generate a first fault-tolerant tempo word corresponding to the first tempo word.