PURPOSE:To attain rapid processing by executing expansive summarizing operation highly in parallel by means of an associative memory device about group identifying processing and rapidly executing said operation by means of an exclusive circuit about summarized value calculating processing. CONSTITUTION:Associative processing is constituted of two phases consisting of a registration phase (phase 1) for registering a group in the associative memory device 3 and a group identification and summarized value calculation phase (phase 2). In the phase 1, different data (group) in data with group-by property (data for summarized operation) are found out and registered by retrieving the device 3. In the phase 2, data to be summarized are identified in each group by retrieving the device 3 and the summarized value of an entry to a summarized value table 5 corresponding to the obtained group number is calculated. In the phase 2, the group identification processing and summarized value calculating processing are regularly executed by pipeline processing.
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