Disclosed is a platform for providing users with a variety of contents and information of on-line/off-line interested party using barcode, method for providing contents using the platform, and a billing system and method therefor. A system for providing wired/wireless contents and information using codes includes a communication entity platform for performing an interested party-related log record process that receives code values from the outside to provide contents information corresponding to each code and provides user and contents information; operating agent platforms for receiving the code values from a user device and distributing code information to the respective communication entity platforms; an on-line interested party module for registering resources corresponding to a variety of contents information in the communication entity platform and providing services such as contents to the user device; and an off-line interested party module for receiving a code needed to provide services such as the contents, which is issued by the operating agent platform, and inserting the issued code into an off-line medium so that a user can select information to be associated with the code.