A wireless communication system comprises a portable telecommunication terminal and a server unit possessed by the communication service provider for the portable communication terminal. The portable communication terminal has a first communication section performing a communication by way of a first wireless path to which flat rate billing system is applied, a second communication section performing a communication a communication by way of a second wireless path to which measured rate billing system is applied; and a communication control section, detecting a candidate for wireless path being available at the current position and, performing a communication at the current location by the first communication section when the first wireless path is detected as a candidate for wireless path.