Game apparatus having input navigation function, said game apparatus being communicatively connectable with a server and being configured for executing, in cooperation with said server and at least one game terminal, an online game, where said game apparatus and said at least one game terminal each is communicatively connected through a respective public communication line with said server and operated by a respective player, and where a stage for said online game is formed in a virtual space of each of said game apparatus and said at least one game terminal and a first operation character to be operated by said player of said game apparatus and at least one second operation characters to be operated by said player of said at least one game terminal are displayed on said stage; said first and said at least one second operation character displayed on said stage being capable of exchanging action messages with each other between said players who operate said first and said at least one second operation characters through said server, said game apparatus comprising: message display means that displays said action message on a display when said action message is delivered from said server; characterized in that it further comprises: input device discriminating means that discriminates a kind of said input device connected with said game apparatus and stores its result; a memory that stores a key navigation table, said key navigation table that sets keys to be operated by said player of said game apparatus with respect to said action messages delivered from said server, corresponding to kinds of said input devices connectable with said game apparatus; and guide icon display means that displays a key to be operated by said player of said game apparatus corresponding to said input device discriminated through said input device discriminating means on said display as a guide icon by referring to said key navigation table when said action message is delivered. message display means that displays said action message on a display when said action message is delivered from said server; characterized in that it further comprises: input device discriminating means that discriminates a kind of said input device connected with said game apparatus and stores its result; a memory that stores a key navigation table, said key navigation table that sets keys to be operated by said player of said game apparatus with respect to said action messages delivered from said server, corresponding to kinds of said input devices connectable with said game apparatus; and guide icon display means that displays a key to be operated by said player of said game apparatus corresponding to said input device discriminated through said input device discriminating means on said display as a guide icon by referring to said key navigation table when said action message is delivered. input device discriminating means that discriminates a kind of said input device connected with said game apparatus and stores its result; a memory that stores a key navigation table, said key navigation table that sets keys to be operated by said player of said game apparatus with respect to said action messages delivered from said server, corresponding to kinds of said input devices connectable with said game apparatus; and guide icon display means that displays a key to be operated by said player of said game apparatus corresponding to said input device discriminated through said input device discriminating means on said display as a guide icon by referring to said key navigation table when said action message is delivered.