Abstract: Each of a plurality of node devices 200 connected by a distributed network includes a program storage unit 201 that stores a processing program for generating case report data by processing clinical trial data, a program execution unit 22 that generates case report data from clinical trial data, and a storage controller 24 that performs a consensus building process for sharing case report data among all the plurality of node devices 200 and causes a data storage unit 202 to store the case report data only when consensus is made. By preparing the case report data by execution of the processing program, falsification can be prevented in a process of preparing a case report even when a check, etc. by a third party is not included. Further, by distributing and storing the case report data in the respective node devices 200 only when validity is proved by the consensus building process, it is possible to prevent the case report from being falsified.