Abstract: To protect a password from leakage, it is necessary to change it frequently, which is troublesome and difficult to be done realistically. According to the present invention, an encrypted access code is stored in a transportable and nonvolatile memory on the part of a computer to be remotely accessed. When a user actually carries the nonvolatile memory to plug it into a computer remotely accessing, remote access is established between the computer to be remotely accessed and the computer remotely accessing.