Method for selecting a network by a terminal and dual-standby terminal

A dual-standby terminal, comprising:

• a first network processing module, a second network processing module, and a control module;
• wherein, the first network processing module is configured to enable a circuit switched (CS) domain to preferably camp on a first network, and execute a CS domain service;
• the second network processing module is configured to enable a packet switched (PS) domain to preferably camp on a second network, and execute a PS domain service;
• wherein, signal coverage of the first network is better than that of the second network, and a data transmission rate of the second network is higher than that of the first network;
• and
• the control module is configured to close the second network processing module when no PS domain service exists in a set duration;
• wherein the control module is further configured to:
• start the second network processing module when a preset condition for performing the route area update process is met;
• determine whether the second network processing module finds the second network cell that meets the camping requirement;
• if yes, when the route area of the second network is changed, or the preset condition for performing the route area update process is that a periodical route area update timer expires and the condition is met, trigger the second network processing module to perform the route area update process, enable the PS domain to camp on the found second network cell, and close the first network processing module;
• when the route area of the second network is not changed, or the preset condition for performing the route area update process is that the periodical route area update timer expires and the condition is not met, close the second network processing module;
• and
• when determining that the second network processing module does not find the second network cell that meets the camping requirement, trigger the first network networking processing module to enable the PS domain to camp on the first network cell on which the current CS domain service camps, and close the second network processing module.