1. An information processing apparatus of an Federated Configuration Management database for managing attribute information of hardware or software application resources constituting a computer system, the information processing apparatus comprising a processor to execute a process including: obtaining a plurality of attribute information of the same hardware and software application resources; calculating, when a contradiction exists among the plurality of attribute information obtained by the acquisition unit, a degree of reliability for each of the plurality of attribute information; and setting the attribute information, which has a highest degree of reliability calculated by the calculating procedure, to be the attribute information of the hardware and software application resources, wherein the processor sets a plurality of processes for calculating a degree of reliability, adds a priority to each of the plurality of processes, and calculates the degree of reliability by a process to which the highest priority is added in the plurality of processes and where as long as the processor, using the highest priority process of the plurality of processes, calculates a plurality of contradictory attribute information as being equally reliable, that highest priority process is removed from the plurality of processes and the reliability is recalculated, whereas when the plurality of contradictory attribute information do not have the same level of reliability, the processor changes the priority of the process that calculated the degree of reliability.