To manage printing order of a host without providing a printer with special control functions in the host-base printer.

The information processor has: a management information storage means; a management information update means; a registration situation decision means for referring to the management information; and a management information transmission means which, when it is decided by the registration situation decision means that the information on other information processors has been registered in the management information, transmits to other information processors management information in accordance with the information on other information processors registered in the management information and order in which the information on other information processors are registered in the management information.