An accounting apparatus and method for a mobile communication system, where a packet service accounting method for a mobile communication terminal includes the steps of checking whether there is an error in a received PPP frame; if there is an erroneous PPP frame in the received PPP frame, generating a PPP control frame containing a size information of the erroneous PPP frame; transmitting the PPP control frame to a base station; and if an authorization response for the PPP control frame is received from the base station, updating a size of total received data, and displaying the updated data size on a display.

 
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