Abstract: An incoming call information transmission system is provided for transmitting incoming call information called to a first communication device via a first communication system service. The incoming call information transmission system includes a virtual secretary system, a database system, an information management system and an information transmission system. The virtual secretary system records the incoming call information. The database system stores preset account information corresponding to a first account of a second communication system service. The first account is logged in the server system providing the second communication system service via the second communication device. The information management system receives the incoming call information and gets the preset account information by looking up the database system.

Abstract: A communication method is provided. Firstly, whether the called-party side communication device is inside an area is judged. When the called-party side communication device is inside the area, the first communication link is established through a wireless local network for the caller side communication device to communicate with the called-party side communication device. When the called-party side communication device is outside the area, a second communication link is established through the mobile network communication for the caller side communication device to communicate with the called-party side communication device.