1. The use of a compound which is 2-amino-2- [2- (4-octylphenyl) ethyl] propap-1,3-diol (FTY720) in free form or in the form of a pharmaceutically acceptable salt for the manufacture of a medicament for the treatment of disseminated sclerosis in a patient in need thereof, said treatment comprising administering a daily dose of 0.5 mg. 2. The use according to claim 1, wherein the compound is in the form of 2-amino-2- [2- (4-octylphenyl) ethyl] propap-1,3-diol hydrochloride. A method for treating multiple sclerosis in a patient in need of such treatment, comprising administering to a patient a daily dose of 0.5 mg of a compound that is 2-amino-2- [2- (4-octylphenyl) ethyl] propap-1,3-diol ( FTY720) in free form or in the form of a pharmaceutically acceptable salt. 4. The method according to claim 3, wherein the compound is in the form of 2-amino-2- [2- (4-octylphenyl) ethyl] propap-1,3-diol hydrochloride. The use of a compound which is 2-amino-2- [2- (4-octylphenyl) ethyl] propap-1,3-diol (FTY720) in free form or in the form of a pharmaceutically acceptable salt for the manufacture of a medicament for the treatment of autoimmune disease in a patient in need thereof, said treatment comprising administering a daily dose of 0.5 mg. 6. The use of claim 5, wherein the compound is in the form of 2-amino-2- [2- (4-octylphenyl) ethyl] propap-1,3-diol hydrochloride. The use of claim 5 or 6, wherein the autoimmune disease is multiple sclerosis, lupus nephritis, rheumatoid arthritis, inflammatory bowel disease, or psoriasis. The use of claim 5 or 6, wherein the autoimmune disease is multiple sclerosis. A method for treating an autoimmune disease in a patient in need of such treatment, including1. Применение соединения, которое представляет собой 2-амино-2-[2-(4-октилфенил)этил]пропап-1,3-диол (FTY720) в свободной форме или в форме фармацевтически приемлемой соли для получения лекарственного средства для лечения рассеянного склероза у пациента, нуждающегося в этом, причем указанн