The cognitive bias of social anxiety groups is being conducted in various empirical studies in the key areas of cognitive processes such as attention, interpretation and memory. While previous studies have shown relatively consistent attention and interpretation bias in social anxiety groups, the results of memory bias have been inconsistent. In order to understand the deficiencies of certain information processing processes in social anxiety groups, the focus should be on the process that causes cognitive bias. Accordingly, recent studies have focused on the role and process of working memory connecting areas of perception, attention, and long-term memory. In this study, we wanted to examine empirically whether the cognitive bias of social anxiety groups in the cognitive realm of attention, interpretation and memory is the same in the realm of working memory. To that end, 423 adult males and females in their 20s were divided into 20 “social anxiety groups” and 20 “normal control groups” by conducting social anxiety scale (SPS) and the Korean version of the Center for Epidemiological Research (CES-D). In order to make this study more relevant, the particpants were exposed to the actual social performance of the speech. Before and after the speech, a task memory task consisting of a numerical reverse memorization test and a Corsy block test and a self-reporting questionnaire were conducted to reveal how the speech performance differed between group working memory and negative self-awareness. In summary, the results of this study are as follows. First, there were no group differences in the performance of task memory for social anxiety groups and normal control groups. Second, significant differences between groups were identified at the level of state social self-efficiency (SSES-S) before and after the speech. Third, differences in interpretation bias were identified depending on the level of social unrest after the speech was carried out.