A liquid injector (400) injects a medical liquid into a patient whose fluoroscopic image data is to be picked up and generates injection history data corresponding to the injection, and a control box (500) registers the injection history data in a RIS (100) in association with imaging order data. Accordingly, the RIS (100) also stores the injection history data associated with the imaging order data, and therefore the injection history data can also be confirmed based on the imaging order data.