This experiment was conducted to compare the effects of peer tutoring with an intelligent teachable agent (TA), the Korea university intelligent agent (KORI), on students'interest and task performance according to their level of self-efficacy. The results showed a significant interaction effect on interest between the peer tutoring/KORI and the level of self-efficacy. The high self-efficacious group had greater interest in peer tutoring than in KORI, whereas the low self-efficacious group had greater interest in KORI than in peer tutoring. Analysis of the task performance revealed that there was a main effect of peer tutoring/KORI and interaction effect on the task performance between peer tutoring/ KORI and the level of self-efficacy. The participants with high self-efficacy received high scores in both peer tutoring and KORI, whereas the participants with low self-efficacy gained higher scores in KORI than in peer tutoring.