A wearable information device is configured to store device identifying information used for identifying the information device registered in advance, to confirm whether or not a taken image, in which an object in a direction of line of vision of a user is taken, shows the information, by image analysis based on the stored device identifying information, and to notify the information device of a result of the confirmation. The information device is configured to execute a predetermined function on the basis of the result of the confirmation of the information device notified from the wearable information device.