| 摘要 |
Provided are a method, and a portable device having a program upgrade function. A method of upgrading a program of a portable device upgrades a program, such as a navigation program or firmware of the portable device, using another portable device within a predetermined range. Program upgrade can be performed between portable devices in movement, that is, it is possible to upgrade a program of a portable device regardless of a place in which the portable devices are located.
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