An information creating device comprising: an associated file extractor configured to identify, for a plurality of applications, one or more files that are accessed due to activation or operation of an application of the plurality of applications during the activation or the operation of the application; an associated application extractor configured to identify, for the plurality of applications, one or more other applications that transmit and receive data to and from the application; and an information storage configured to store, in a memory, associated file information that indicates, for the plurality of applications, the one or more files accessed during the activation or the operation of the application as associated files of the application, and associated application information that indicates, for the plurality of applications, the one or more other applications that transmit and receive data to and from the application as associated application of the application, wherein the associated file extractor acquires, using an operating system, OS, used by the application, a list indicating an access destination file that is accessed by any file during the activation or the operation of the application and an access source file which has accessed the access destination file, and traces, starting from a configuration file of the application, an access destination file and an access source file in the list that is acquired, to identify the one or more files accessed due to the activation or the operation of the application during the activation or the operation of the application, wherein the associated application extractor identifies, using an operating system, OS, used by the application, the one or more other applications that use an identical port with a port that the application is using, as an application that transmits and receives data to and from the application. an associated file extractor configured to identify, for a plurality of applications, one or more files that are accessed due to activation or operation of an application of the plurality of applications during the activation or the operation of the application; an associated application extractor configured to identify, for the plurality of applications, one or more other applications that transmit and receive data to and from the application; and an information storage configured to store, in a memory, associated file information that indicates, for the plurality of applications, the one or more files accessed during the activation or the operation of the application as associated files of the application, and associated application information that indicates, for the plurality of applications, the one or more other applications that transmit and receive data to and from the application as associated application of the application, wherein the associated file extractor acquires, using an operating system, OS, used by the application, a list indicating an access destination file that is accessed by any file during the activation or the operation of the application and an access source file which has accessed the access destination file, and traces, starting from a configuration file of the application, an access destination file and an access source file in the list that is acquired, to identify the one or more files accessed due to the activation or the operation of the application during the activation or the operation of the application, wherein the associated application extractor identifies, using an operating system, OS, used by the application, the one or more other applications that use an identical port with a port that the application is using, as an application that transmits and receives data to and from the application.