PROBLEM TO BE SOLVED: To prevent the reading of waveform data from a storage means from being delayed even in simultaneous access to the storage means.;SOLUTION: Based on each of a plurality of analog waveforms and for each node where amplitude varies within each of the waveforms, a plurality of waveform data composed of partial waveform data (waveforms 1-3) showing both the period of time until the next node and the state of changes in the amplitude are created. For each of the plurality of waveform data created, the partial waveform data at each node is ranked. If the partial wave data with the same time of the node (t5) is ranked in different ranks (addresses) in the ranking (A), vacant ranks are provided among the ranking up to the time (t5) for the waveform 3 with a small number of nodes, so that the partial waveform data is ranked in the same rank.;COPYRIGHT: (C)2007,JPO&INPIT
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