The purpose of this research was to investigate dichotic listening, that is, whether the left and right ears have different functionalities in actual listening. Unlike previous studies, which used short words or a list of two or three numbers, these researchers investigated more comprehensive listening ability using the Toeic listening test. Sixty-three university students participated in this study. The subjects took three tests in total: one using only the right ear, another using the left ear, and the third using both. T-analysis of SPSS on the data revealed that there is a significant difference between the test results with only the right or left ear and the ones with both ears. So we cannot find right-ear priority in this study. We can see that in comprehensive listening, right hemisphere plays an important role as well as left hemisphere. When grouped according to language ability, test result of low group is the same as the total test result. However, in high group there is no significant difference between the test results with left ear and the results with both ears in high group. In mid group there is no significant difference between the test results with right ear and the results with both ears. The different functionalities of left and right ears and suggestions for future research are presented.