Provided are a method of providing a service relating to content stored in a portable storage device to an external device, and an apparatus therefor. The method includes outputting a user interface to manage information relating to contents stored in the portable storage device through a display unit associated with the external device, receiving a command to select content from among the contents through the output user interface, executing a service corresponding to the content selected based on the command, and providing a result of executing the service to the external device.