The purpose of this study is to investigate the factors affecting PTSD of disaster victims, focusing on the differences among three groups with different levels of disaster information related to recovery and relief services: non-information, information trust, and information distrust. The 3rd wave data collected in 2018 by the National Disaster Management Research Institute were analyzed. The main results of this study are as follows. First, the rate of PTSD level was highest in the information distrust group. Second, only the information trust group showed that information satisfaction affects the risk of PTSD. Third, the lower the subjective health status and the lower the level of satisfaction with relief aid and service distributions, the lower the PTSD rates for all groups. Fourth, gender, age, education, average monthly income, and social support were found significant factors in the non-information group, while education and average monthly income were found significant in the information trust group. The results highlight the need to provide reliable information on disaster in a variety of ways based on the level of PTSD symptoms according to the level of disaster information provided.