A business process estimating method, apparatus, and program for estimating a process of a business transaction utilizing an information system. The business process estimating method includes specifying a non-operation interval for extracting an information system non-operation interval in accordance with an access log of access to the information system, thereby to specify a business process corresponding to the extracted information system non-operation interval and to specify the information system non-operation interval. The method also includes distributing a non-operation interval time period for distributing a time period of the information system non-operation interval, which has been specified in the specifying the non-operation interval as process time periods of previous and subsequent business processes respectively correlated with previous and subsequent information system non-operation intervals with respect to the information system non-operation interval.
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