A computer-readable medium includes a program including processes of correlating electronic information which is correlated to a first correlation location in a first correlation structure also to a second correlation location in a second correlation structure according to a correlation condition based on the first correlation location or the electronic information, and executing an operation on the electronic information or the first correlation location in the first correlation structure, wherein there can be switched permission and forbiddance of execution of at least a part of the operations, among the operations, which changes a correlation result in the correlating.