A cloud SIM card management server, comprising: a request acquisition unit configured to acquire a cloud SIM allocation request sent from a user terminal, wherein the allocation request carries device identification information; a cloud SIM card acquisition unit configured to acquire a cloud SIM card and network access information from a system database and store the device identification information, the cloud SIM card and the network access information in association; and a cloud SIM card transmission unit configured to transmit the cloud SIM card and the network access information to the user terminal; characterized in that, the cloud SIM card acquisition unit comprises: an identification judgment sub-unit configured to judge whether the cloud SIM card allocation request carries flag for requesting network access information, wherein the flag for requesting network access information indicates whether the user terminal needs to acquire the network access information corresponding to the cloud SIM card in the server; a first cloud SIM card acquisition sub-unit configured to acquire the cloud SIM card in the system database and take the device identification information as the network access information, if a judgment is that the cloud SIM card allocation request doesn't carry the flag for requesting network access information; and a second cloud SIM card acquisition sub-unit configured to acquire a cloud SIM card to be allocated and the network access information in the system database, and store the device identification information, the cloud SIM card to be allocated and the network access information in association, if a judgment is that the cloud SIM card allocation request carries the flag for requesting network access information. a request acquisition unit configured to acquire a cloud SIM allocation request sent from a user terminal, wherein the allocation request carries device identification information; a cloud SIM card acquisition unit configured to acquire a cloud SIM card and network access information from a system database and store the device identification information, the cloud SIM card and the network access information in association; and a cloud SIM card transmission unit configured to transmit the cloud SIM card and the network access information to the user terminal; characterized in that, the cloud SIM card acquisition unit comprises: an identification judgment sub-unit configured to judge whether the cloud SIM card allocation request carries flag for requesting network access information, wherein the flag for requesting network access information indicates whether the user terminal needs to acquire the network access information corresponding to the cloud SIM card in the server; a first cloud SIM card acquisition sub-unit configured to acquire the cloud SIM card in the system database and take the device identification information as the network access information, if a judgment is that the cloud SIM card allocation request doesn't carry the flag for requesting network access information; and a second cloud SIM card acquisition sub-unit configured to acquire a cloud SIM card to be allocated and the network access information in the system database, and store the device identification information, the cloud SIM card to be allocated and the network access information in association, if a judgment is that the cloud SIM card allocation request carries the flag for requesting network access information. an identification judgment sub-unit configured to judge whether the cloud SIM card allocation request carries flag for requesting network access information, wherein the flag for requesting network access information indicates whether the user terminal needs to acquire the network access information corresponding to the cloud SIM card in the server; a first cloud SIM card acquisition sub-unit configured to acquire the cloud SIM card in the system database and take the device identification information as the network access information, if a judgment is that the cloud SIM card allocation request doesn't carry the flag for requesting network access information; and a second cloud SIM card acquisition sub-unit configured to acquire a cloud SIM card to be allocated and the network access information in the system database, and store the device identification information, the cloud SIM card to be allocated and the network access information in association, if a judgment is that the cloud SIM card allocation request carries the flag for requesting network access information.