Patent ID: 7496418

Claim:
A method for adjusting an output level of audio data, comprising: receiving an audio file; checking audio level information recorded in the received audio file; and adjusting an output level of audio data to be reproduced of the received audio file, on the basis of the checked audio level information, wherein the audio file is separated into a header information area, an audio data area, and a tag information area, wherein the audio level information is stored in the tag information area and an audio level information flag is stored in the header information area, and wherein the adjusting comprises: comparing the checked audio level information with a predetermined reference level; adjusting a gain of the audio data to be reproduced in accordance with the comparison result and an audio volume level set by a user; and amplifying and outputting the audio data to be reproduced, at the adjusted gain, wherein the adjusting a gain comprises: calculating a ratio between the predetermined reference level, a current audio file, and a next audio file; and modifying the gain according to the ratio, wherein the predetermined reference level is an average audio level of audio files requested to be played.