近年來隨著科技的發展與網際網路連線品質的提升，人們的生活方式不再
受到時間和實際地理空間的限制，人們只需要透過電腦及行動通訊裝置與網際網路的雲端技術結合，就能進入無疆界、無時差的虛擬空間系統當中，從事各種活動。然而，人們的上網模式與習慣的改變，也使人們對於網站的設計有了新的需求，為了減輕開發時程的負擔，自適應性網頁設計 (Responsive Web Design；RWD) 因而誕生。只需要透過開發一個RWD網站就能適用多種尺寸大小的螢幕或解析度。網際網路已經是現今人們搜尋資訊最主要的工具之一，然而時常因為網站上的資訊量過於龐大，往往導致使用者在網站的大量資訊空間中迷失方向，有鑑於此，本研究針對RWD網站選單設計在進行各種不同裝置間轉換過程中，產生螢幕大小的調整、展開資訊量的多寡及階層架構的增減，造成無法順利找到目標，而浮現的資訊搜尋導航問題與使用者心智負荷程度進行探討。本研究採用混合二因子實驗設計來探討，透過30位受試者進行網頁資訊搜尋任務與生理數據測量。研究結果顯示選單展開資訊的數量會造成操作上需要滑動畫面，對使用者在搜尋績效及主觀評量產生影響，選單展開時呈現較少資訊量，不需要滑動手機畫面的選單設計有較佳的操作績效與使用者主觀評量，於本研究的發現可提供未來網頁設計師參考方向量。

In recent years, the improvement of technology and internet connection quality are resulting people has no limitation of time and space. By the integration of computer and mobile communication device with the cloud technology makes people easy to enter and do their activity in the virtual space at the same time without any border. Nowadays, the change of people’s habit in surfing the internet, such as using different device size or resolution caused the new demand of website design. Responsive Web Design (RWD) came up to simplify the development of website, which is by developing one RWD website, it could fit in varied sizes or resolutions of the display. People usually use internet to search for information, but they face problems related to the overload information in the website. This research discusses the issues of information search and mental workload from the users when using the RWD website menu design and its transition in different devices due to the screen size adjustment, amount of information, and hierarchy. Those can lead the user unable find the target.
The experiment of this research applied two mixed factorial design, by proceeding information searching task and measuring physiological data of 30 participants. The result shows that users have to slide the screen when the expansion of menu information is too much. It would affect users’ searching performance and subjective assessment. On the contrary, the design with less menu information expanded would have better searching performance and subjective assessment. This discovery can be a reference for the website designer in the future.

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