The problem to be addressed by the present invention is to provide a system for assisting smooth patient referral from a referral source medical institution to a referral medical institution, in particular, one preventing occurrences of rehospitalization due to cases difficult to assess from simple patient attributes alone or due to the quality of medical care. In order to resolve the problem, a referral difficulty calculation means calculates a referral difficulty quantifying the risk of not being able to discharge a patient due to no referral medical institution being found, taking into account a rehospitalization risk calculated at a rehospitalization risk calculation means, as well as geographical distance between the patient and referral medical institution, total number of accepted patients, and number of available beds. The referral difficulty is output to output means of a referral source medical institution or a referral medical institution.
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