The information processor includes a device communication performance management module. The device communication performance management module includes: a communication performance evaluation unit that measures and evaluates the communication performance with respect to a device to be used when it is used by a device-use application; a device naming rule management unit that manages a naming rule for incorporating the communication performance evaluated by the communication performance evaluation unit into the name of the device file for a device as the target of evaluation; and a device file management unit that creates a device file for a device as the target of evaluation in accordance with the naming rule based on the result of communication performance evaluation. The result of communication performance evaluation by the communication performance evaluation unit is incorporated into the name of a device file and the evaluation result is thereby provided to a device-use application.