Patent ID: 8862078

Claim:
A communication method in a communication terminal having a single communication module and at least two Subscriber Identification Module (SIM) cards, the method comprising: performing a first call mode when a first call is connected through a first base station in a standby mode using the communication module and a first SIM card through a first time slot in each frame allocated by the first base station; detecting, when a second call is received through a second base station while performing the first call mode, a user input for determining whether to perform a second call mode; performing, when a user input corresponding to a request to perform the second call mode is detected, the second call mode using the communication module and a second SIM card through a second time slot in the each frame allocated by the second base station, the second time slot being spaced apart from the first time slot; estimating an echo component from the first call and the second call; calculating a function to reduce the echo component based on the estimated echo component; and modifying an audio signal corresponding to at least one of the first call and the second call based on the calculated function to reduce the echo component.