Digital photo frame, a system thereof, and a method thereof

A method for transmitting photos or videos from a terminal to a digital photo frame, the method comprising:

• receiving, from the terminal and by a controller of the digital photo frame, a request for transmitting the photos or the videos;
• determining, by the controller of the digital photo frame, whether the digital photo frame is communicably connected to a server via a public network;
• determining, by the controller of the digital photo frame, whether the digital photo frame and the terminal use a same wireless local area network (WLAN);
• instructing, by the controller of the digital photo frame, the terminal to transmit the photos or the videos via the WLAN in response to a determination that the digital photo frame and the terminal use the same WLAN;
• and
• instructing, by the controller of the digital photo frame, the terminal to transmit the photos or the videos via the public network in response to a determination that the digital photo frame and the terminal do not use the same WLAN,
• wherein determining, by the controller of the digital photo frame, whether the digital photo frame is communicably connected to the server via the public network comprises:
• sending, by the digital photo frame, a message to the server at a predetermined time interval, the predetermined time interval defining a time window between each two neighboring time points;
• and
• determining, by the controller of the digital photo frame, whether the digital photo frame receives a response from the server within the time window.