Patent ID: 8060768

Claim:
A power saving method for sending and receiving instant messages from a portable Internet device using an instant messaging program comprising: monitoring a display unit of the portable Internet device; controlling the instant messaging program to enter into a first mode, when the display unit is in a view state; controlling the instant messaging program to enter into a second mode, when the display unit is in a non-view state; providing a proxy; connecting the proxy while the instant messaging prgram is executed; transmitting a user ID information to an instant messaging platform through the proxy to complete a logon procedure; and transmitting a data to the instant messaging platform through the proxy; wherein the message update frequency of the instant messaging program in the second mode is lower than the message update frequency in the first mode, wherein the proxy receives a paging of the portable Internet device through a wireless communication base station connected to the portable Internet device to determine whether or not the instant messaging program is still running according to the paging and then disable the function of the instant messaging program for periodically transmitting a connection keep-alive message or a conversation keep-alive message, and selectively transmitting the connection keep-alive message or the conversation keep-alive message by the proxy to the instant messaging platform according to the determination result.