Portable information terminal and program

A program for causing a computer mounted on a portable information terminal, the portable information terminal including a ROM area that stores (1) a first inter-process communication function unit that partially constitutes a first administrative application program having an administrative privilege and is capable of transmitting information to and from other application programs, (2) an authentication application name that partially constitutes the first administrative application and is used to authenticate an application program that is a source of transmission of information, (3) a second administrative application program having no administrative privilege, and (4) an application name, a shared name, and a signature of the second administrative application program, and a RAM area that stores an application name, a shared name, and an ID of an installed application program and is managed via an OS (Operation System), to function as the first inter-process communication function unit to execute:

• a process of acquiring an ID of an application program that is a source of transmission of information;
• a process of acquiring a shared name corresponding to the acquired ID from the RAM area;
• a process of, if the shared name has been successfully acquired, comparing the shared name with the authentication application name;
• a process of, if the shared name matches the authentication application name, authenticating the application program that is the source of transmission;
• and
• a process of, if the shared name has not been successfully acquired, terminating the process.