| 摘要 |
The present invention comprises: a first communication module to communicate with a terminal; a second communication module which communicates with the terminal and has the same kind of a communication method; and a control unit to set any one communication module of the first and second communication modules as a master module, to set the other communication module as a slave module, and to change the communication module which is set as the slave module to the master module, if the communication between the terminal and the communication module which is set as the master module is impossible, to make the communication module communicate with the terminal. The present invention can communicate with the terminal without link loss by communicating with the terminal by using two communication modules. In other words, the present invention can maintain an executing function by maintaining a connection state between the other communication module and the terminal when the link loss between any one communication module and the terminal is generated. Thus, the present invention can solve a problem such as a connection failure, disconnection, etc. with the terminal by converting a role between dual communication modules when the problem of the connection failure, the disconnection, etc. is generated. |
