Provided is a resource management method in a system which individually limits a resource amount used by a software module (143) and adjusts the total of the maximum resource amounts used by respective software modules to be smaller than the entire system resource amount. When installing or executing a new software module, step 406 checks whether a software module group already installed or being executed is stably operating according to an execution history thereof; and step 407 checks whether to enable the installation or execution by including the maximum actual resource use value in the total from the execution history.