The purpose of this study was to explore the effects of using a book club's differentiated
levels for an extensive English reading program on university students' language creativity.
In order to accomplish this purpose, the program was applied to the two groups. The
experimental group read texts with various topics and genres within their level in regular
club meetings. The results of the study are as follows: First, the experimental group showed
statistically significant improvements in language fluency by reading many kinds of different
stories. Second, the experimental group showed a higher improvement in language flexibility
than the control group. Third, it was shown that the more improvement was shown from
students who read over 20 books, which means it became more positive toward language
creativity through the extensive readings of various topics and genres. Based on the
research results above, I suggest the future research experiments should focus on the book
club's differentiated levels English reading program for language originality and other
creativity factors needed.