A medical device system includes a first medical device and a second medical device. The first medical devices includes a first measuring unit that acquires measurement data of vital signs of a patient and a first communication unit that transmits the measurement data acquired by the first measuring unit to the second medical device. The second medical device includes a second communication unit that receives the measurement data from the first communication unit. The first and second medical devices are configured so that if certification processing succeeds, the measurement data is permitted to be used in the second medical device.
