In Korea, for mental disease, the Mental Health Act was revised into the Mental Health Welfare Act in May, 2017. Along with that, the approaches for the mentally disabled have been changed from the treatment-oriented model to the rehabilitation model and to the independent life model for the sake of community integration. This means that it is focused on interventions to help those suffering from mental diseases or disorders to improve their control over their situations and enhance their rights of self-determination. Along with that, the meaning of families of the mentally disabled is also changing from the negative view in the past to the concept of resources that can aid their treatment and rehabilitation. As a matter of fact, however, the number of homes for the mentally disabled or those residing in them is not decreasing very much, and deinstitutionalization is presently in the transitional period. As hindrance factors that the mentally disabled face in terms of community integration, there are factors associated with their will to live independently and their psychological factors such as lethargy coming from their long stay in the facility, low self-efficacy, and their family’s uncooperative factors. In order to realize their community integration and enhancement of their life quality, we should pay attention to improving their self-efficacy and heightening their control over their life on their own. To enhance their self-efficacy, it is needed to get rid of their depression and anxiety, and to improve their life quality, it is necessary to utilize family support as one of the crucial resources. Although family support is one of the main variables associated with self-efficacy which is ability that the mentally disabled have to manage their diseases and symptoms, there has not been much research done on the disabled staying in homes for the mentally disabled. In this context, this author has tried to divide family support into two factors (positive & negative) and examine the effects of it on self-efficacy. According to the results, when positive family support is provided more, their self-efficacy becomes more enhanced.