Abstract: A last will and testament service method is provided which enables people to draw up their wills before their death without feelings of reluctance and the wills to be surely transferred after the death of a testator/testatrix. Will information and authentication information are produced by a testator terminal. The will information is registered on a last will and testament service terminal. Updating information and authentication information are transmitted by the testator terminal. The will information is updated by the last will and testament service terminal. A notice of death of the testator/testatrix is accepted by a public office terminal and is registered as dead person information and dead person information is transmitted. When the dead person information is received by the last will and testament service terminal and, after the death of the testator is confirmed, the will information is transmitted. The will information is received by an heir terminal.