画像の付加，階層構造がWeb探索効率に及ぼす影響-画面情報量に基づく評価-

摘要

Three kinds of quantity of information (perceptual, cognitive, and selective) in Web search task were proposed and defined. The correlation between these quantities of information was examined, and it was also explored how these quantities of information affected the Web search performance. The following three kinds of Web sites were prepared : Web sites with no images (character-based hyperlink) , with images (characterbased hyperlink with images) , and with image-based hyperlinks. For each type of Web site, the quantity of information above was calculated in order to investigate how such quantities were related to the Web search time. It was found that the correlation between cognitive and selective quantity of information was high irrespective of the existence of images. In other words, the quantity of explanatory information corresponding to cognitive quantity of information had a higher correlation with the number of links (selective quantity of information) . The perceptual quantity of information had a lower and non-significant correlation with the cognitive or the selective quantity of information, which meant that the perceptual quantity of information did not depend on the number of links or the quantity of explanatory texts.