A camera system comprising a camera and a hub connected to the camera, wherein the camera system allows handing over while the hub and a portable terminal device (smart phone) are communicating via a router. This camera system adopts a configuration provided with a DECT camera for transmitting media data that includes audio data and/or video data, and a hub for receiving the media data transmitted from the DECT camera, periodically receiving an IP address notification from a previously correlated smart phone, and transmitting the media data to the transmission source of the latest of the IP address notification.