block diagrams of mobile communication terminals each compatible with different mobile communication systems according to the present invention referring to fig2 a the mobile communication terminal includes at least one modem chip supporting a single communication method such that the mobile communication terminal can be used for at least one communication method referring to fig2 b the mobile communication terminal includes a single modem chip supporting at least one communication method such that the mobile communication terminal can be used in at least one communication method for example the mobile communication terminal of fig2 a includes two modem chips one for gsm gprs wcdma and the other for cdma hereinafter this mobile communication terminal will be referred to as a two chip mobile communication terminal in detail the two chip mobile communication terminal includes a gsm gprs wcdma connection module 210 and a cdma connection module 220 the gsm gprs wcdma connection module 210 includes a first rf if unit 201 and a gsm gprs wcdma modem chip 203 so as to support the gsm gprs wcdma method the cdma connection module 220 includes a second rf if unit 211 and a cdma modem chip 213 so as to support the cdma method in another example the mobile communication terminal of fig2 b uses only one modem chip for gsm gprs wcdma and cdma methods hereinafter this mobile communication terminal will now be referred to as a single chip mobile communication terminal in detail the single chip mobile communication terminal includes a gsm gprs wcdma cdma connection module 230 supporting both the gsm gprs wcdma and cdma methods the gsm gprs wcdma cdma connection module 230 includes a gsm gprs wcdma cdma modem chip 223 and an.