System for managing the secure transfer of digital content to a vehicle navigation device

A mobile phone (100-1) transmits an identification number of the mobile phone (100-1) to a car navigation device (500). Next, the mobile phone (100-1) transmits a host application to the car navigation device (500). The car navigation device (500) stores the identification number and the host application. Upon receipt of a request in which an identification number is included from the car navigation device (500), the mobile phone (100-1) checks the identification number. If the number is correct, the mobile phone (100-1) transmits a guest application executable with the host application to the car navigation device (500). As a result, illegal copy of a digital content via local communication is prevented.