1. A system for predicting a demand on a computer resource, comprising: first means for acquiring a first log on a use of the resource and a second log on transactions using the resource; second means for estimating resource utilization for each transaction on the basis of information on resource use included in the first log and information on the number each transaction processed included in the second log; third means for acquiring the second log and, performing a statistical time-series analysis on the basis of time-series data of the number of each transaction processed, and predicting a future amount of processing volume for each transaction type; and fourth means for predicting a computer resource demand on the basis of the resource utilization for each transaction estimated by said second means and the future amount of processing for each transaction predicted by said third means.