to the movement of a user who uses a mobile terminal for supporting both first and second mobile communication services to establish a call connection state a mobile communication network includes at least two mobile communication systems adapting mutually independent communication methods and a mobile terminal using the two mobile communication systems application_number US 72683603 A description preferred embodiments of the present invention will be described in detail below with reference to the attached drawings in the drawings elements which are the same are denoted by the same reference numerals even though they are depicted in different drawings in the following description a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear a synchronous mobile communication service according to the present invention may be for example a cdma service or a is 95a b service an asynchronous mobile communication service according to the present invention may be for example a gsm service a wcdma service or a pdc personal digital cellular service which is widely used in japan according to the present invention it is possible to perform a handover from the cdma or is 95a b service to the gsm wcdma or pdc service also according to the present invention it is possible to perform a handover from the gsm wcdma or pdc service to the cdma or is 95a b service it is further possible according to the present invention to perform a handover between different asynchronous mobile communication services such as gsm and wcdma services 0021 fig1 is a view illustrating a block diagram of a multimode multiband mobile communication terminal in.