To obtain a system for easily operating comparison with the information of the other medicine in a simple device.

When a medicine name is inputted, the medicine basic information of a medicine basic information table 110 is displayed as a list in a medicine basic information form 300, and whether or not the information of pertinent medicine is present in an in-blood concentration table 130, significant side effect table 140, and use inhibition table 150 is displayed on each button 331-334, and each information is displayed by the operation of each button. The picture information of the structural formula of the medicine is displayed in the medicine basic information form, and the feature of medicine can be captured based on the structural formula. Each retrieval button in each structure classification and each medical effect classification is present in the medicine basic information form, and the information of the other medicine in the same classification is displayed as a list by operating each button. When medicine to be used at the same time is inputted, a mutual action due to the medicine is retrieved from a mutual action table 160 by operating a mutual action retrieval button. Also, retrieval by a merchandise name can be attained by a merchandise name table 120.