A check support apparatus includes a design-data acquiring unit, a connector-information display unit, and a pin-information sorting unit. The design-data acquiring unit acquires design data including pin information that indicates association between a pin name and a net name of each pin of the first connector and a pin name and a net name of each pin of the second connector. The connector-information display unit displays, on a display unit, first pin information of the first connector and second pin information of the second connector included in the design data. The pin-information sorting unit sorts each of the first pin information and the second pin information in a predetermined order.