In this paper, the minutes of the monetary policy of the Bank of Japan, the central bank of Japan, for the year 1998 has been analyzed for the extraction of the topics concerning Asian financial crisis. The currency crisis started in Thailand in 1997 and spread toward many Asian countries. We analyzed the Monetary Policy Meeting minutes by text mining technologies. Especially we conducted topic extraction from the meeting minutes using Latent Dirichlet Allocation (LDA) model and the time series of the changes of extracted topic ratios are shown. From the analysis results, one topic which seems to be the Asian financial crisis related topic can be found. The topic ratio change curve clearly corresponds to the calm down of economic indices such as currency exchange ratios and market interest rates in the Asian countries.