Abstract: Provided are a method of predicting waiting days for a medical examination requiring a reservation at a hospital, the method including acquiring examination prescription and execution data, calculating, based on the examination prescription and execution data, an average ratio of executed examinations for each day required from a prescription to the execution thereof, and an average number of prescriptions based on past weekdays, estimating, based on the average number of prescriptions based on past weekdays, an average number of prescriptions based on future weekdays for a predetermined period by using at least one time-series prediction model, calculating a monthly increment in the average number of prescriptions based on future weekdays, compared to the average number of prescriptions based on the past weekdays, and allocating, based on the average number of prescriptions based on the past weekdays and the monthly increment, an expected number of prescriptions based on future weekdays.