A method and apparatus of changing the number of calls in a multicall
communication mode including detecting an occurrence of handover,
transmitting a special message having inserted therein call-number
changing information regarding the increase or decrease of a number of
calls to a switching center as a connection destination connected by
handover, transmitting the special message to inform a number of calls
capable of being supported to a mobile terminal, receiving a reply
regarding a desired call to be maintained selected from a plurality of
calls, and rearranging the handover process so the desired call is
maintained in connection while the call not desired is disconnected.
Thereby allowing the user of the mobile terminal to select a desired call
to be maintained when handover is executed under the congested state
condition in the communication system which hinders smooth handover from
one switching center to another.