廣告是呈現社會變遷的一面鏡子，透過日東紅茶廣告可以發現日治時期受到日本統治及西方文化的影響，西方紅茶文化傳播至臺灣，在臺灣結合了西方、日本及臺灣的文化元素，在文化方面呈現出西、日、臺三種文化融合的現象。社會方面，日東紅茶廣告反映出日治時期臺灣社會的變遷，包含女性地位的提升，當時的社會風尚，以及由於臺灣中產階級的增加，因此紅茶廣告由原先象徵貴族式的飲茶文化，普及到中產階層。日治時期臺灣紅茶所蘊涵的文化現象及社會特質，並非是全然西式的西方紅茶文化，而是融合西方、日本與臺灣的文化特色，並反映出當時臺灣的社會現象。

Commercials act as mirrors of social change. Nittoh Black Tea commercials from the Japanese Colonial Period reflect the influences of Japanese colonialism and Western culture. When Western black tea culture spread to Taiwan, it fused with Western, Japanese, and Taiwanese cultural elements. From a cultural perspective, this can be seen as a phenomenon of cultural integration. From a sociological perspective, Nittoh Black Tea commercials reflect aspects of social change in Taiwan during the Japanese Colonial Period - an increase in the social status of women, changes in social practices, and the rise of the middle class. In response to this, black tea commercials went from depicting black tea as a symbol of the aristocracy to something that could be enjoyed by the middle class. Drawing from Nittoh Black Tea commercials and other related historical data, this paper reveals how Taiwan’s black tea culture embodied cultural phenomena and social characteristics of Taiwan during the Japanese Colonial Period. It is a Western tea culture that is not entirely Western. Rather, it is one that fuses Western, Japanese, and Taiwanese cultural elements, and reflects social phenomena occurring in Taiwan during that era.