Computer technology has been used in classrooms for many years and yet many educators still do not understand its effectiveness. In addition, with the Internet technology becomes increasingly mature and more popular, instructors of multimedia-based CAI are now facing the issue of whether or not they should upgrade their technologies under limited budget. In this study, a network meta-analysis was performed to synthesize existing research comparing the effects of different types of CAI versus the traditional instruction (TI) on students’ learning achievement in Taiwan. 34 studies obtained from Taiwan’s National Digital Library of Theses and Dissertations were reviewed systematically, and their quantitative data was transformed into effect size (ES). The results of this study demonstrate that CAI is more effective than TI in students’ learning achievement in Taiwan. Furthermore, the effect of CAI increases as information technology improves and the effect of Internet-based CAI is better than that of multimedia-based CAI. To improve the effect of CAI, this paper suggests that schools use Internet-based CAI instead of multimedia-based CAI.