3. A speech recognizing apparatus according to claim 1 wherein the input speech has syllables and wherein the duration predicator predicates the duration data for each one of the recognition units of the input speech using the following equation: ##EQU17## where represents a predicated value of the duration data of an n-th syllable of the input speech; d(i) represents the duration data of an i-th syllable of the input speech; and w(i) represents a weighing value of the duration data of an i-th syllable of the input speech.
3. A speech recognizing apparatus according to claim 1 wherein the input speech has syllables and wherein the duration predicator predicates the duration data for each one of the recognition units of the input speech using the following equation: ##EQU17## where represents a predicated value of the duration data of an n-th syllable of the input speech; d(i) represents the duration data of an i-th syllable of the input speech; and w(i) represents a weighing value of the duration data of an i-th syllable of the input speech. 6. A speech recognizing apparatus according to claim 3 wherein the reference speech is divided into a plurality of smaller reference sections, each one of said plurality of smaller reference sections forming a reference recognition unit, the speech recognizing apparatus further comprises a reference speech duration storage buffer for storing duration information of each of a plurality of factors that affect the duration of each one of the reference recognition units, and wherein the duration predicator predicates the duration of each one of the recognition units of the input speech using the following equation: ##EQU20## where represents the predicated value of the duration data of the n-th syllable of the input speech; d(i) represents the duration data of the i-th syllable of the input speech; and w(i,m) represents a weighing value relative to d(i) at an m-th one of the factors that affects the duration of each one of the recognition units.