The life-sustaining medical information processing system application is one of the information processing systems operated by the national life-sustaining medical management institution in accordance with the 『Life-sustaining treatment decision act』. It is a service to support the creation of related documents at the medical institution where the pre-information of life-sustaining medical care registration institution and the medical institution ethics committee are installed. . Therefore, only those who have received user approval from an institution that has already been designated or registered in the information processing system (https://intra.lst.go.kr) can access the service.[Advanced life-sustaining medical care registration agency]The prior letter of intent registration institution is designated by the Ministry of Health and Welfare in accordance with the 「Life-sustaining treatment decision act」 and supports the preparation and registration of the advance directive on life-sustaining treatment, and the task of notifying and managing the advance directive on life-sustaining treatment requested to be registered, changed, or withdrawn to the management organization is responsible for To this end, the life-sustaining treatment information processing system application supports registration agency users (consultants) with application tasks such as preparation, change, and withdrawal of advance directives for life-sustaining treatment. The prior written, changed, or withdrawn letter of intent for life-sustaining treatment through the application must be confirmed by the registration authority manager (registrant) and notified to the national life-sustaining treatment management organization.[Medical institution registered with the Medical Institution Ethics Committee]Refers to a medical institution that intends to carry out tasks related to the decision to suspend, etc., life-sustaining treatment in accordance with the 「Life-sustaining treatment decision act」. Accordingly, the life-sustaining medical information processing system application supports the work of the doctor in charge of the relevant medical institution to create, register, change, and withdraw related documents such as the life-sustaining medical plan.