To solve the problem wherein when any failure occurs in a server device, and the entire data volume of a print log to be stored exceeds the capacity of a nonvolatile memory, printing must be immediately prohibited.

An interface part 1 transmits the print log to the server device connected to a network 12, and a time interval measuring part 5 measures a time interval for receiving a print log acquisition request signal for requesting transmission of the print log from the server device. A failure detection part 6 detects failure if the measurement result of the time interval measuring part 5 is a predetermined value or more, and a warning report part 7 reports a warning according to the detection of failure by the failure detection part 6.