Abstract: A computer receives, using a first communication method, first data transmitted from a first information processing device. The computer transmits, using a second communication method different from the first communication method, the first data to a second information processing device different from the first information processing device. The computer receives, using the second communication method, a reception acknowledgement for the first data from the second information processing device. The computer transmits, using the first communication method, the reception acknowledgement to the first information processing device. The computer detects one of a first error and a second error. The first error is an error in communication between the computer and the first information processing device. The second error is an error in communication between the computer and the second information processing device.

Abstract: A computer receives, using a first communication method, first data transmitted from a first information processing device. The computer transmits, using a second communication method different from the first communication method, the first data to a second information processing device different from the first information processing device. The computer receives, using the second communication method, a reception acknowledgement for the first data from the second information processing device. The computer transmits, using the first communication method, the reception acknowledgement to the first information processing device. The computer detects one of a first error and a second error. The first error is an error in communication between the computer and the first information processing device. The second error is an error in communication between the computer and the second information processing device.

Abstract: A distribution method includes: receiving, by a relay device that is provided within the certain segment, a distribution request that is used to receive image information that includes a file structure having one or more files such that the image information is divided into a plurality of pieces, from a distribution destination device that is provided within a certain segment in a communication network; transferring, by the relay device, the distribution request to a distribution source device that is provided outside the certain segment; transmitting, by the distribution source device, each divided pieces of the image information to the relay device in response to the distribution request; and receiving, by the relay device, each divided pieces of the image information from the distribution source device and transferring each divided pieces of the image information to the distribution destination device.

Abstract: A backup method includes detecting a first OS that is to be backed up, among plural OSs running on a computer and exclusive of a second OS; extracting information concerning resources used by the first OS among resources of the computer, the information being extracted upon detecting the first OS and from a first memory area that the second OS is authorized to access and that the first OS is not authorized to access; copying the information from the first memory area to a second memory area that the second OS and the first OS are authorized to access; and backing up the information of resources after copying the information to the second memory area. The backup method is executed by the computer.