The person who looks up information is called a "researcher."
The word "researcher" comes from the verb "research," which means to study or investigate something in order to gain knowledge or understanding about it.
Examples in Engpsh:
She is a researcher in the field of computer science.
The company hired a team of researchers to gather information for their latest project.
中文翻译:
她是计算机科学领域的研究员。
公司雇用了一个研究团队，以收集他们最新项目的信息。