The present invention is a peritoneal dialysis and hemodialysis hybrid-remedy planning method using an index that is shared by both peritoneal dialysis and hemodialysis and indicates an effect of dialysis. To be specific, the index is M/C(0)/VB, which is obtained by dividing a ratio M/C(0)—where M is a removal amount of a solute for a fixed time period, and C(0) is a concentration of the solute in blood before the dialysis—by a patient's body fluid volume, VB. The present invention is capable of representing the dialysis effect of PD and HD as an integrated sum, achieving concise and explicit PD and HD hybrid-remedy planning.