Abstract: An active information sharing system having a master device and a slave device is disclosed. When the master device is connected to a first host of an administrator, the master device automatically links to a server through a first network module of the first host, for sharing at least an information from the administrator. The master device correspondingly sets a first parameter to the slave device. When the slave device is connected to a second host of an invited client, the slave device automatically links to the server through a second network module of the second host according to the first parameter, for acquiring the information shared from the administrator.