This study is to analyze the difference of the information amount in enterprises’ timely disclosure when consolidated financial statements, in lieu of individual financial statements, are used due to the change of principal financial statements to consolidated financial statements by the adoption of K-IFRS. To examine the difference of the information amount in enterprises’ timely disclosure, this study analyzed the difference of the information amount in timely disclosure,and information effect of the enterprises which disclosed both individual financial statements and consolidated financial statements out of the enterprises which disclosed ratio and profit &loss structure showing changes of disclosed information amount due to the changes of principal financial statements from 2005 to 2008. The analysis showed that the information amount decreased by the use of consolidated financial statements was about 4.7% of the entire information amount disclosed. The analysis in the particular markets showed that the information amount was decreased by 8.9% in KOSPI market and 0.7% in KOSDAQ market. In addition, the analysis showed that the disclosed information amount was increased when consolidated financial statements were used in disclosure of changes of profit and loss structure because the number of enterprises sorted as large corporations or conglomerates were increased. Therefore, it can be presumed that decrease of the information amount in timely disclosure is not significant by the use of consolidated financial statements in timely disclosure. Although accumulated abnormal stock return of the number of disclosures was decreased by 0.5% by the use of consolidated financial statements in timely disclosure, it is not statistically significant and the decrease of the information amount in timely disclosure does not affect decision making of information users. By discovering that variation of information amount and information effect caused by the use of different financial statements are not significant, this study can be useful to policy decision of the proper authorities which monitors appropriate information amount of enterprises in timely disclosure. In addition, this study makes it possible to provide to information users timely disclosure using consistent financial statements by providing verifiable evidence on information in timely disclosure using consolidated financial statements disclosed according to the concept of economic single entity and purpose of adoption of K-IFRS.