The present invention discloses a data processing method, apparatus, client, server and system, which belong to the field of computer technologies. The method includes: a client sending a target object transfer request to a resource platform server; the resource platform server generating a target object transfer instruction accordingly and returning the target object transfer instruction to the client; the client generating an operation instruction according to transfer confirmation performed on the target object transfer instruction and sending the operation instruction to a resource transfer server; and the resource transfer server transferring, according to the operation instruction, an exchange resource that corresponds to the target object from a first resource account to a second resource account. The present invention solves the problem of low security of a client and a resource platform server developed by a target object provider, and improves the security of a target object transfer process.