A vehicle electronic device, an electronic device and information receiving and sending methods thereof, a server and a communication system. The vehicle electronic device includes: a first processing component and a first storage component connected with the first processing component. First password information and vehicle information are stored in the first storage component. The first processing component Is configured to generate a second dynamic password according to the first time for receiving a connection request and the first password information and the vehicle information stored in the first storage component when receiving the connection request including a first dynamic password sent by an external electronic device, and to receive information sent by the external electronic device when determining that the second dynamic password is matched with the first dynamic password.