PROBLEM TO BE SOLVED: To provide a patch application program, a patch application system, and a patch application method capable of applying the latest patch regardless of the situation of the data file of a terminal device.SOLUTION: A terminal device 1 transmits a request for transmission of a patch to a patch providing device 3 (step S1). The patch providing device 3 receives the request for transmission of the patch from the terminal device 1 (step S2). The patch providing device 3 transmits the patch to the terminal device 1 when receiving the request for transmission of the patch (step S3). The terminal device 1 receives the patch transmitted from the patch providing device 3 (step S4), and applies the received patch to a data file including one or more data (step S5), and ends.SELECTED DRAWING: Figure 4
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