An apparatus for performing communication by a dual network terminal is disclosed. The dual network terminal is a dual network and dual standby terminal, and the apparatus includes a 3G wireless communication subsystem, a 2G wireless communication subsystem and an identity identification module. The 2G wireless communication subsystem is connected with the identity identification module and the 3G wireless communication subsystem respectively, the 3G wireless communication subsystem is connected with the 2G wireless communication subsystem, and the 3G wireless communication subsystem and the 2G wireless communication subsystem include one virtual identity identification card administration module respectively. A method for performing communication by a dual network terminal is further disclosed, including: the 2G wireless communication subsystem reading information in the identity identification card in the identity identification module, storing the information in its own first virtual identity identification card administration module, and communicating with the 2G network by using the information.