The purpose of this study was to examine the effectiveness of providing information of Web discussion to increase the interactions between group members during Web discussion. The participants were twenty of college students, and they were randomly grouped into five with four members. Students were participated into two sessions of Web discussion. The independent variable of this study was the presence and absence of Short Message Serve(SMS) via mobile phone. Two dependent variables were measured for this study. The first dependent variable was the frequencies of upload message per student to the Web discussion in terms of three periods of discussion: 1) early , 2) middle, and 3) final periods of discussion. The second dependent variable was the response date of reply to a message. With respect to the first dependent variable, when students were in the first web discussion, SMS was not given. However, for the second web discussion, the information of how many discussions were upload to the web discussion through SMS. The result of the study showed that providing SMS significantly affected on the frequencies of uploading message in the middle of discussion. However, there were no difference in the early and final periods of discussion. For the second dependent variable of this study, the response date of reply to a message was significantly decreased when SMS was given to students. It indicated that SMS could increase learner's awareness of the discussion process; thus, it positively affected on increasing the interaction between students during the Web discussion.