A signature support system includes a local machine, a remote machine, a document management server, and a signature server. The remote machine uses terminal services of the local machine to access the document management server, and correlates document data with a document ID serving as identification information for the document data, to register the document data in the document management server. Similarly, the signature server is accessed, and caused to generate a pair of a signature key and a verification key, and the keys are correlated with biological information read by a biological information reader, and are registered in the signature server. The signature server generates signature data for the document data that is correlated with the document ID received from a user, and is registered in the document management server, by using the signature key correlated with the biological information read by the biological information reader, and registered in the signature server.