A method and a portable device for supporting an adaptive data communication control are provided. The device includes a memory unit, a control unit, and a radio frequency unit. The memory unit stores a table that contains data communication setting information corresponding to each service operator network. The control unit performs a Public Land Mobile Network (PLMN) selection after entering into a service area of specific service operator network, and receives Mobile Country Code/Mobile Network Code (MCC/MNC) information from the specific service operator network while the PLMN selection is being performed. The control unit extracts the data communication setting information corresponding to the MCC/MNC information from the table, and establishes a data communication connection with the specific service operator network according to the extracted data communication setting information. The radio frequency unit performs the established data communication with the specific service operator network under the control of the control unit.