A high strength steel sheet consisting of, by weight, C: 0.001% to 0.004%, Si: 0.5% or less, excluding 0%, Mn: 1.2% or less, excluding 0%, P: 0.005% to 0.12%, S: 0.01% or less, N: 0.01% or less, acid soluble AI: 0.1% or less, excluding 0%, Ti: 0.01% to 0.04%, a remainder of Fe, and unavoidable impurities, and optionally further comprising one or more selected from the group consisting of, by weight, Nb: 0.005% to 0.04%, and B: 0.002% or less, wherein the contents of Ti, N, and S satisfy the following Relationship 1, a ratio b/a of an average random intensity ratio b of an orientation group of to [-1-12] to an average random intensity ratio a of an orientation group of to at a point t/4 in a thickness direction of the steel sheet is 2.3 or more, wherein t is a thickness of the steel sheet, a bake hardenability of the steel sheet is 4MPa or more and an average plastic anisotropy coefficient (Lankford value, r-value) of the steel sheet is 1.9 or more, wherein the steel sheet comprises FeTiP precipitates of 0.2/μm 2 or less, measured according to the description, wherein the r-value is measured using ASTM STD specimen, wherein the bake hardenability is evaluated as a difference between a yield strength value of JIS 5 standard specimen after performing a 2% pre-strain, and a yield strength value after further holding the specimen again at 170°C for 20 minutes, and wherein the average random intensity ratio b of an orientation group of to [-1-12] and the average random intensity ratio a of an orientation group of to are calculated and analyzed using an EBSD based on an ND direction crystal orientation under the conditions of Rolling R, Transverse T, and Vertical N at a1/4t point in a thickness direction of the steel sheet, − 0.02 ≤ Ti − 24 / 7 N − 3 / 2 S ≤ 0.025 where each of [Ti],, and refers to the content of the corresponding element by weight%. and optionally further comprising one or more selected from the group consisting of, by weight, Nb: 0.005% to 0.04%, and B: 0.002% or less, wherein the contents of Ti, N, and S satisfy the following Relationship 1, a ratio b/a of an average random intensity ratio b of an orientation group of to [-1-12] to an average random intensity ratio a of an orientation group of to at a point t/4 in a thickness direction of the steel sheet is 2.3 or more, wherein t is a thickness of the steel sheet, a bake hardenability of the steel sheet is 4MPa or more and an average plastic anisotropy coefficient (Lankford value, r-value) of the steel sheet is 1.9 or more, wherein the steel sheet comprises FeTiP precipitates of 0.2/μm 2 or less, measured according to the description, wherein the r-value is measured using ASTM STD specimen, wherein the bake hardenability is evaluated as a difference between a yield strength value of JIS 5 standard specimen after performing a 2% pre-strain, and a yield strength value after further holding the specimen again at 170°C for 20 minutes, and wherein the average random intensity ratio b of an orientation group of to [-1-12] and the average random intensity ratio a of an orientation group of to are calculated and analyzed using an EBSD based on an ND direction crystal orientation under the conditions of Rolling R, Transverse T, and Vertical N at a1/4t point in a thickness direction of the steel sheet, − 0.02 ≤ Ti − 24 / 7 N − 3 / 2 S ≤ 0.025 where each of [Ti],, and refers to the content of the corresponding element by weight%.