[目的/意义]本文旨在从信息处理进路（approaches to information processing）的角度，探究图书馆信息学（Library and Information Science, LIS）相对于其他信息学科的独特性，为该学科在保持自身独立性的前提下思考与其他学科的交叉渗透关系提供启迪。[方法/过程]本研究采用逻辑推理为主、归纳为辅的方法。在推理阶段，主要借鉴Olsson和Hj??rland的推理思路构建信息处理的象限或面向（orientations）。具体说来，它以信息概念作为逻辑起点，将信息解析为数据和意义两大要素，然后将它们分别作为信息处理的对象和结果，形成信息处理的四个可能象限。在此基础上，借助各象限中的实际事例，分析LIS信息处理进路的特点。[结果/结论]研究显示，传统的或经典的LIS信息处理进路具有以下特征：（1）LIS既处理信息的数据，也处理信息的意义，其目的是从数据和意义两个方面保障信息的查询与获取；（2）任何信息的数据和意义都可能成为LIS信息处理的对象，这是因为LIS要保证任何有价值的信息都能被其需求者查询和获取到；（3）LIS信息处理的结果，主要是辅助信息查询和获取的数据以及关乎LIS客体或LIS学科的意义。这些特征构成了LIS信息处理进路的独特性。以这些特征为参照，本文对20世纪末以来LIS领域不断增长的其他信息处理过程表达了困惑。

[Purpose/significance] This study attempts to demonstrate LIS’s distinctiveness as compared with other information-related disciplines from the perspective of information processing.[Method/process]It does so primarily through logical deduction complemented by cases-based induction. The logical deduction starts from the concept of information, which defines information as the combined product of data and meaning. [Result/conclusion]It shows that an information processing can take either data or meaning as input and output, giving rise to four information-processing orientations: data to data, data to meaning, meaning to data, and meaning to meaning. It then shows that LIS processes both data and meaning in its professional work and research; and that it accepts any data and meaning as input, but produces primarily data that facilitate information search/access and meaning that concerns LIS objects and LIS domain itself.