Power consumption can be suppressed while maintaining an appropriate execution speed. The information processor (1) has an interpreter for interpreting a source program or intermediate language program and a run-time translator for translating the program into a machine language program native to the computer. The information processor (1) comprises a power-saving request monitor (126) for monitoring whether or not there is a power-saving request from an input interface or a predetermined power-saving request in a given memory, and a power-saving translation controller (129). The power-saving request makes a request for suppression of the power consumed by the processor (1). The power-saving translation controller (129) makes a decision as to whether the run-time translator executes run-time translation of the program according to whether there is the power-saving request. Based on the result of the decision, the translation controller instructs the run-time translator to execute the run-time translation.