An installation apparatus comprised by a host computer and used to install a driver of a printing apparatus which supports a plurality of languages to said host computer, comprising: a language information storing section adapted for storing a driver support language definition file containing a list of support languages of drivers and a panel support language definition file containing a list of languages supported a panel display section of said printing apparatus; a driver language selecting section for prompting the user to select a designation language and for receiving driver language designation information, said driver language selecting section being adapted for displaying the language names of the driver support language definition file on a language selection screen as options for prompting the user to select a language; a panel language selecting section adapted for displaying the language names of said panel support language definition file on a language selection screen as options for prompting the user to select a language; a judging section for judging whether the driver language designation information designated by the user through the driver language selecting section is included in the two files being the driver support language definition file and the panel support language definition file or is only included in the driver support language definition file; a panel language default altering section; said apparatus being adapted such that when said judging section judges that the panel support language definition file includes the driver language designation information, said panel language default altering section is adapted to alter the language name displayed on the language selection screen by said panel language selecting section to the same language as the driver language designation information; wherein when said judging section judges that the panel support language definition file does not include the driver language designation information, said panel language selecting section is adapted to display a screen to set a language in the selection decision frame of operational panel language as a default and prompts the user to select the panel language. a language information storing section adapted for storing a driver support language definition file containing a list of support languages of drivers and a panel support language definition file containing a list of languages supported a panel display section of said printing apparatus; a driver language selecting section for prompting the user to select a designation language and for receiving driver language designation information, said driver language selecting section being adapted for displaying the language names of the driver support language definition file on a language selection screen as options for prompting the user to select a language; a panel language selecting section adapted for displaying the language names of said panel support language definition file on a language selection screen as options for prompting the user to select a language; a judging section for judging whether the driver language designation information designated by the user through the driver language selecting section is included in the two files being the driver support language definition file and the panel support language definition file or is only included in the driver support language definition file; a panel language default altering section; said apparatus being adapted such that when said judging section judges that the panel support language definition file includes the driver language designation information, said panel language default altering section is adapted to alter the language name displayed on the language selection screen by said panel language selecting section to the same language as the driver language designation information; wherein when said judging section judges that the panel support language definition file does not include the driver language designation information, said panel language selecting section is adapted to display a screen to set a language in the selection decision frame of operational panel language as a default and prompts the user to select the panel language.