18. An alphanumeric registration device for use in a system having a push button telephone with alphanumeric entry keys, said alphanumeric registration device comprising: alphanumeric registration control means for controlling alphanumeric registration within said system; first storage means for temporarily storing a first key input entered as a first electrical signal through said alphanumeric entry keys, said first key input indicative of a group value; second storage means for temporarily storing a second key input entered as a second electrical signal through said alphanumeric entry keys, said second key input indicative of a party value; and alphanumeric information generation means for generating an alphanumeric symbol under control of said alphanumeric registration control means, said alphanumeric symbol corresponding to said group value and said party value, said alphanumeric symbol being one of a numeric symbol and an alphabetic symbol, said alphabetic symbol being in one of an upper case and a lower case; said alphanumeric symbol generated being said numeric symbol whenever said group value is equal to a value represented by said numeric symbol and said party value is equal to a first value; said alphanumeric symbol generated being said alphabetic symbol in said upper case whenever said group value is equal to a value indicated on said alphanumeric entry keys corresponding to said alphabetic symbol and said party value is equal to one of a second, third and fourth value; said alphanumeric symbol generated being said alphabetic symbol in said lower case whenever said group value is equal to said value indicated on said alphanumeric entry keys corresponding to said alphabetic symbol and said party value is equal to one of a fifth, sixth and seventh value.
19. The alphanumeric registration device as claimed in claim 18, further comprising: third storage means for temporarily storing said alphanumeric symbol generated from said alphanumeric information generation means under the control of said alphanumeric registration control means; and alphanumeric registration memory means for registering said alphanumeric symbol after said alphanumeric symbol is stored in said third storage means whenever a registration termination key is input.