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信息检索的并行性研究包括数据并行和功能并行，而数据并行可表现为ＳＩＭＤ系统中的数据级并行以及分布式系统或ＭＩＭＤ系统中的数据集并行。本文讨论数据级并行检索和数据库的分布式并行检索两种方式，并在二者间作一简单比较。
Parallelism in information retrieval includes data parallelism and functional parallelism, and data parallelism can be represented as data-level parallelism in SIMD systems and parallelism of data sets in distributed systems or MIMD systems. This article discusses both data-level parallel retrieval and database distributed parallel retrieval and makes a simple comparison between the two.