To provide a global loaming function to a code division multiple access(CDMA) telephone set by providing the communication method with a step for inserting respective binarized decimal numbers to respective positions of a 2nd format array related to respective positions of a memory and other steps.

Decoded original decimal numbers corresponding to international mobile station identification(IMSI)-S are stored in a memory array by element numbers 0 to 9 (S140) and the values of IMSIs, 11, 12 are inputted by element numbers 10, 11 (S150). Then the value of national mobile station identification(NMSI)-LENGTH is calculated (S160). Then each MCC is inputted to a memory array by an element corresponding to the value of the NMSI-LENGTH (S170). Respective digits on respective positions of the array are converted from a decimal format into a corresponding 4-bit binarized decimal format (S180). Each converted decimal number is mapped and inserted into a corresponding position of octet array structure (190).