PROBLEM TO BE SOLVED: To indicate the safety and effectiveness of drugs at the time of commonly applying more than two drugs by providing the system with a means for selecting the names of applying medical supplies at the time of prescribing and preparing the medical supplies and retrieving and displaying superimposing and mutual operation information from the relation of the names with stored information. SOLUTION: When more than two medical supplies are decided by a doctor based on an examination result so as to be prescribed, a system including a personal computer 2 is operated and more than two decided prescribed chemicals are selected from a medical supply sight table which is displayed in a display device 3. Various pieces of superimposing and mutual operation information are retrieved based on the selected prescribed chemicals in accordance with a retrieval flow. When more than one piece of information exists, which is related to more than one of other selected and prescribed chemicals, in the superimposing and mutual operation information, the whole information is displayed. The doctor judges priority by viewing display concerning the displayed superimposing and mutual operation information and prints- out the name of the decided medical supplies and applying superimposing and mutual operation information.
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