自1980年代後半，日本半導體大廠曾經是領導地位，直到1992年英特爾取而 代之至今。藉由剖析及比較日本與美國雙方企業模式、全球市場目標、以及所開發 之半導體運用終端產品，進而分析出日本半導體廠商為何失去其市場份量之原因所 在。全球市場銷售手法上，日本半導體廠商被批判未能策略性的滲透亞洲新興開發 中國家，太過於集中在日本市場的策略，而美國廠商集中於亞洲快速成長的市場， 助長美國成為全球領先的地位，目前佔有約30%的市場份量。 然而領先者不會永遠領先的，除非有先驅的技術及過人的策略，使其與其他保 持一定的距離不會被超越，然而日本廠商距此仍有一段距離需超越，原因是已錯過 了近年來最具成長力道的手機以及平板電腦的市場先機。日本廠商唯有朝向未來社 會--老化時代的來臨需求，找出一條致勝先機。 此未來社會需建構在情報通訊科技的基礎上，日本通產省規劃出 u-Japan為國策，更加速推進所謂的“ubiquitous”世代，其建構在電腦化城市以及智慧型電網的社會上。 日本半導體廠商正朝此邁進，配合國家策略加速半導體技術的開發，車用產品是目 前日本半導體新的機會，過去日本已是領導廠商，相信未來的智能社會，日本仍是車用市場的大贏家。 Japanese companies ever leaded the Semiconductor Industries in 1980''s until 1992 INTEL changed the situation. I analyzed the root causes of why Japan lost its share, by comparing business models, global market target, Semiconductor''s application target. In global approaching way results analysis, Japanese companies are criticized that they have no strategy to strengthen to Asian new emerging countries, because they too focus on Japanese domestic market, that enabled US companies to dedicate to make quickly growth Asian markets and helped US''s Semiconductor companies win near 30% share in the world. However, winner is not always the winner who must implement more advanced solution and strategy in order to keep leader with certain range. Japanese Semiconductor companies seem to stay behind the market line without capturing the most growing applications as SmartPhone and Tablet PC since 2010 year till now. On the other hand, Japanese Semiconductor companies could find their contingency plans or new strategies for new world wide coming aging society. A new society adopts more and more ICT related system and program, therefore u-Japan is escalated to promote so-called "ubiquitous society", in which it utilizes more computers and smart grids. Japan Semiconductor Companies aim to this new society which needs Semiconductor''s technology and big support. Also they strive to make their own developments, and recover their own markets that belong to Japan now and future.