A wireless Internet access module, adapted to be a part of a secure digital card, comprising a secure digital storage function unit, an interface to the secure digital card function unit, the interface function unit being configured to connect to a first host provided with an interface to the secure digital card, the wireless Internet access module being characterized in that: the wireless Internet access module further comprises a wireless Internet access processing function unit, and a data synchronization function unit, wherein the wireless Internet access processing function unit is configured to perform dialing according to preset dialing information and sign in a network space indicated by preset network space information and the preset dialing information, and the wireless internet access module is adapted to obtain the preset network space information through the interface function unit; and the data synchronization function unit is configured to synchronously update data in the network space and the secure digital storage function unit of the wireless Internet access module according to a preset synchronization policy, and the preset synchronization policy is obtained through the interface function unit; the wireless Internet access module further comprising an adaptation unit, wherein the interface function unit is further configured to, when being connected to a second host, obtain the preset dialing information, the preset network space information and the preset synchronization policy; and the adaptation unit is configured to simulate the wireless Internet access processing function unit, the secure digital storage function unit and the data synchronization function unit into a partition of a secure digital card and report the partition to the second host; and further configured to write the preset dialing information and the preset network space information into the wireless Internet access processing function unit, and write the preset synchronization policy into the data synchronization function unit. the wireless Internet access module further comprises a wireless Internet access processing function unit, and a data synchronization function unit, wherein the wireless Internet access processing function unit is configured to perform dialing according to preset dialing information and sign in a network space indicated by preset network space information and the preset dialing information, and the wireless internet access module is adapted to obtain the preset network space information through the interface function unit; and the data synchronization function unit is configured to synchronously update data in the network space and the secure digital storage function unit of the wireless Internet access module according to a preset synchronization policy, and the preset synchronization policy is obtained through the interface function unit; the wireless Internet access module further comprising an adaptation unit, wherein the interface function unit is further configured to, when being connected to a second host, obtain the preset dialing information, the preset network space information and the preset synchronization policy; and the adaptation unit is configured to simulate the wireless Internet access processing function unit, the secure digital storage function unit and the data synchronization function unit into a partition of a secure digital card and report the partition to the second host; and further configured to write the preset dialing information and the preset network space information into the wireless Internet access processing function unit, and write the preset synchronization policy into the data synchronization function unit.