To enable the host server side to be aware of the recovery of an error when the error is recovered by the user's power off/on operation, the most recent state regarding occurrences of errors at printer 16 (steps S61 and S62) is stored in the backup RAM 12a each time a status change occurs (steps S63 and S64), and when an user performs a power off/on operation and a printing device is re-activated (step S65), if a most recent state at the time of the previous activation was in a state of service call error occurrence (step S66), the current status of the printer 16 is then sent (steps S68 and S69).