A system for handling valuable documents is provided that comprises a validator 2 for validating authenticity of a valuable document, and a printer 3 for printing on a card 20 information in validator 2 and an interface 4 for connecting validator 2 and printer 3 for their intercommunication. Automatically or after a certain period of time, validator 2 transmits its stored validation information to printer 3 through interface 4. Otherwise, receiving a transmission instruction signal of validation information given upon turning a trigger switch on or receiving a retrieval instruction signal from printer 3, validator 2 transmits its stored validation information to printer 3 through interface 4 to print the validation information on card 20.