A non-transitory computer-readable computer medium stores instructions for a patient attempting to quit smoking. The instructions cause a computer to: obtain smoking cessation-related health-care history information of the patient updated by the patient attempting to quit smoking; determine, based on the smoking cessation-related health-care history information, a cognitive-behavioral therapy to be performed, to obtain patient's understanding information about smoking related to the cognitive-behavioral therapy; when a request timing comes, transmit to a patient-side electronic device a patient's understanding information request; receive, from the patient-side electronic device, the patient's understanding information about smoking; determine, by comparing the received patient's understanding information with predetermined correct response information about smoking, whether the patient has a correct patient's understanding about smoking; and when the patient's understanding about smoking is incorrect, transmit, to the patient-side electronic device, cognitive-behavioral therapy information based on the predetermined correct response information.