The present invention provides a computing apparatus for a real estate contract. According to an aspect of the present invention, the computing apparatus comprises : a communication unit to receive a deposit temporary approval request message for a first object which can be checked by a user terminal of a consumer; and a processor to temporarily approve an amount corresponding to a deposit to deal the first object, and use the communication unit to transmit a reservation request message to a transaction server of the first object. According to another aspect of the present invention, the computing apparatus temporarily approves a cancellation fee associated with a first object for which transaction information is provided by a transaction server. The computing apparatus may comprise : a communication unit to receive a cancellation fee temporary approval request message associated with the first object for which the transaction information is provided by the transaction server from a user terminal of a seller; and a processor to temporarily approve an amount corresponding to the cancellation fee to deal the first object, and use the communication unit to transmit a cancellation fee temporary approval verification message to the transaction server.(110) Seller(120) Card(130) Transaction server(141) Upload transaction information related to real estate for sale(142) Transmit a cancellation fee temporary approval request message(143) Transmit a cancellation fee temporary approval verification message(144) Transmit a cancellation fee temporary approval verification messageCOPYRIGHT KIPO 2017