An information processing method for an information processing device
which performs multiple types of authentication processing performing
authentication processing before accepting at least one or more
independent services and executing the aforementioned services. The
information processing method includes: a receiving step for receiving
service requests including the authentication information from the
external terminal; a calling step for calling the authentication
processing which performs authentication processing corresponding to the
services requested from the external terminal, referencing first
information which describes the authentication processing calling
procedure corresponding to the service; an output step for receiving and
outputting results of the called authentication processing; and a calling
step for calling the accepted services according to the results of the
authentication processing output in the output step.