The invention provides a contract cancellation system, a server, and a contract cancellation method, when users take contract procedures due to an error in an inappropriate psychological state, the user can properly process the contract procedure after executing the contract procedure. The contract cancellation system comprises the following components: a first communication terminal for handlingcontract procedures; a second communication terminal for canceling contract procedures; and a server capable of communicating with the first communication terminal and the second communication terminal; the first communication terminal comprises: a first operation unit operated by the first user; an acquisition unit that acquires the biometric data of the first user; the first transmission unit transmits the contract history information to the server; and the second communication terminal includes the second operation for the second user to operate; the second transmitting unit transmits a cancellation request notification to the server; and the server includes: a first receiving unit that receives the contract history information; a recording unit that records the contract history information; and a contract processing unit that executes the contract procedure or cancels the contract procedure.